taut: global flag editor

TVDOS: userconfigpath and zfmrc
Taud: sentinel values moved to negative octave range
2026-06-06 05:28:31 +09:00 · 2026-05-17 23:18:06 +09:00 · 2026-05-17 00:25:40 +09:00 · 2026-05-16 19:33:17 +09:00 · 2026-05-16 12:26:45 +09:00 · 2026-05-15 23:36:14 +09:00
27 changed files with 2913 additions and 182 deletions
--- a/TAUD_NOTE_EFFECTS.md
+++ b/TAUD_NOTE_EFFECTS.md
@@ -779,7 +779,7 @@ if V.dittoActive and armRow <= N <= V.dittoEndRow:
    srcRow = V.dittoSourceStart + ((N - V.dittoSourceStart) mod V.dittoLength)
    src    = patternRows[V.pattern][srcRow]

-    cell.note       = (raw.note != 0xFFFF) ? raw.note       : src.note
+    cell.note       = (raw.note != 0x0000) ? raw.note       : src.note
    cell.instrument = (raw.instrument != 0) ? raw.instrument : src.instrument

    # SEL_FINE / 0 is the canonical no-op encoding for the vol- and pan-columns;
--- a/assets/disk0/!BOOTSEC
+++ b/assets/disk0/!BOOTSEC
@@ -1 +1 @@
-let p=_BIOS.FIRST_BOOTABLE_PORT;com.sendMessage(p[0],"DEVRST\x17");com.sendMessage(p[0],'OPENR"tvdos/hyve.SYS",'+p[1]);let r=com.getStatusCode(p[0]);if(0==r)if(com.sendMessage(p[0],"READ"),r=com.getStatusCode(p[0]),0==r){let g=com.pullMessage(p[0]);eval(g)}else println("I/O Error");else println("TVDOS.SYS not found");println("Shutting down...");println("It is now safe to turn off the power")
+let p=_BIOS.FIRST_BOOTABLE_PORT;com.sendMessage(p[0],"DEVRST\x17");com.sendMessage(p[0],'OPENR"tvdos/TVDOS.SYS",'+p[1]);let r=com.getStatusCode(p[0]);if(0==r)if(com.sendMessage(p[0],"READ"),r=com.getStatusCode(p[0]),0==r){let g=com.pullMessage(p[0]);eval(g)}else println("I/O Error");else println("TVDOS.SYS not found");println("Shutting down...");println("It is now safe to turn off the power")
--- a/assets/disk0/AUTOEXEC.BAT
+++ b/assets/disk0/AUTOEXEC.BAT
@@ -1,7 +1,9 @@
 echo "Starting TVDOS..."

 rem put set-xxx commands here:
-set PATH=\tvdos\installer;\tvdos\tuidev;$PATH
+set PATH=\tvdos\installer;\tvdos\tuidev;\tbas;\hopper\bin;$PATH
+set INCLPATH=\hopper\include;$INCLPATH
+set HELPPATH=\hopper\help;$HELPPATH
 set KEYBOARD=us_colemak

 rem this line specifies which shell to be presented after the boot precess:
--- a/assets/disk0/COPYING
+++ b/assets/disk0/COPYING
@@ -1,4 +1,4 @@
-Copyright (c) 2020-2024 CuriousTorvald
+Copyright (c) 2020-2026 CuriousTorvald

 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal
--- a/assets/disk0/etc/motd
+++ b/assets/disk0/etc/motd
@@ -1,3 +1,3 @@
-TVDOS (c) 2020-2024 CuriousTorvald
+TVDOS (c) 2020-2026 CuriousTorvald

 TVDOS is provided "as is", without warranty of any kind; in no event shall the authors or copyright holders be liable for any claim, damages or other liabilities. Run 'less COPYING' for more information.
--- a/assets/disk0/hopper/bin/hopper.js
+++ b/assets/disk0/hopper/bin/hopper.js
@@ -3,3 +3,4 @@
 * Created by CuriousTorvald on 2026-04-16
 */

+println("Hopper - Package manager for TSVM")
--- a/assets/disk0/tbas/basic.js
+++ b/assets/disk0/tbas/basic.js
@@ -32,7 +32,7 @@ if (exec_args !== undefined && exec_args[1] !== undefined && exec_args[1].starts
    return 0
 }

-const THEVERSION = "1.2.1"
+const THEVERSION = "1.2.2"

 const PROD = true
 let INDEX_BASE = 0
@@ -4197,7 +4197,7 @@ bF.load = function(args) { // LOAD function
    if (args[1] === undefined) throw lang.missingOperand
    var fileOpened = fs.open(args[1], "R")

-
+    serial.printerr('load '+args[1])
    if (replUsrConfirmed || cmdbuf.length == 0) {
        if (!fileOpened) {
            fileOpened = fs.open(args[1]+".BAS", "R")
@@ -4241,7 +4241,7 @@ bF.yes = function() {
    }
 }
 bF.catalog = function(args) { // CATALOG function
-    if (args[1] === undefined) args[1] = "\\"
+    if (args[1] === undefined) args[1] = BASIC_HOME_PATH
    var pathOpened = fs.open(args[1], 'R')
    if (!pathOpened) {
        throw lang.noSuchFile
@@ -4251,6 +4251,57 @@ bF.catalog = function(args) { // CATALOG function
    com.sendMessage(port, "LIST")
    println(com.pullMessage(port))
 }
+// Load a file by absolute disk path (bypasses BASIC_HOME_PATH).
+// Used by COMPILE to fetch /tbas/compile.js.
+bF._slurpAbsolute = function(path) {
+    var port = _BIOS.FIRST_BOOTABLE_PORT
+    com.sendMessage(port[0], "FLUSH")
+    com.sendMessage(port[0], "CLOSE")
+    com.sendMessage(port[0], 'OPENR"' + path + '",' + port[1])
+    if (com.getStatusCode(port[0]) != 0) return undefined
+    com.sendMessage(port[0], "READ")
+    if (com.getStatusCode(port[0]) >= 128) return undefined
+    var s = com.pullMessage(port[0])
+    com.sendMessage(port[0], "FLUSH"); com.sendMessage(port[0], "CLOSE")
+    return s
+}
+bF.compile = function(args) { // COMPILE "OUT.JS" -- transpile cmdbuf to JS
+    if (args[1] === undefined) {
+        println("Usage: COMPILE \"out.js\""); return
+    }
+    if (cmdbuf.length === 0) {
+        println("No program loaded"); return
+    }
+    if (bS._compileImpl === undefined) {
+        // Lazy-load compile.js from /tbas/compile.js
+        var src = bF._slurpAbsolute("/tbas/compile.js")
+        if (src === undefined) {
+            println("Cannot load /tbas/compile.js")
+            return
+        }
+        try { eval(src) } catch (e) {
+            println("Failed to load compiler: " + e); return
+        }
+        if (bS._compileImpl === undefined) {
+            println("compile.js loaded but did not define bS._compileImpl"); return
+        }
+    }
+    var outpath = args[1]
+    // Strip surrounding quotes if any
+    if ((outpath.charAt(0) === '"' || outpath.charAt(0) === "'") &&
+        outpath.charAt(outpath.length - 1) === outpath.charAt(0)) {
+        outpath = outpath.substring(1, outpath.length - 1)
+    }
+    // Default to .js extension if missing
+    if (!/\.[A-Za-z0-9]+$/.test(outpath)) outpath += ".js"
+    try {
+        var n = bS._compileImpl(outpath)
+        println("Wrote " + n + " bytes to " + outpath)
+    } catch (e) {
+        serial.printerr(e + "\n" + (e.stack || ""))
+        println("Compile error: " + e)
+    }
+}
 Object.freeze(bF)

 if (exec_args !== undefined && exec_args[1] !== undefined) {
--- a/assets/disk0/tbas/compile.js
+++ b/assets/disk0/tbas/compile.js
@@ -0,0 +1,564 @@
+// Terran BASIC -> JavaScript compiler
+// Loaded into basic.js's context by `bF.compile`. Re-uses bF._interpretLine
+// (tokeniser + elaborator + parser + pruner) verbatim and emits a self-
+// contained JS program that does its work via `let bS = require("tbas")`.
+//
+// On load, attaches `bS._compileImpl` to the live bS object.
+
+;(function() {
+
+// ---------- helpers ----------------------------------------------------------
+
+function isValidJsId(s) {
+    return /^[A-Z_][A-Z0-9_]*$/i.test(s)
+}
+function varRef(name) {
+    const u = String(name).toUpperCase()
+    return isValidJsId(u) ? `bS.__state.vars.${u}` : `bS.__state.vars[${JSON.stringify(u)}]`
+}
+function jsLit(v) { return JSON.stringify(v) }
+
+// Resolve a literal AST node down to a raw JS value at compile time. Used
+// for harvesting DATA constants. Only constant-propagatable types are
+// permitted; otherwise compile-time evaluation fails.
+function literalValue(node) {
+    if (!node) return undefined
+    switch (node.astType) {
+        case "num":    return Number(node.astValue)
+        case "string": return String(node.astValue)
+        case "bool":   return Boolean(node.astValue)
+        case "null":   return undefined
+        case "lit":    return String(node.astValue) // bare identifier in DATA: keep as string
+        default:
+            throw Error("DATA: unsupported literal node type: " + node.astType)
+    }
+}
+
+// Returns the maximum varIndex used at the immediate scope of a lambda body,
+// hence its arity.
+function lambdaArity(body) {
+    let maxIdx = -1
+    function walk(t, level) {
+        if (!t || !t.astType) return
+        if (t.astType === "defun_args" && t.astValue[0] === level) {
+            if (t.astValue[1] > maxIdx) maxIdx = t.astValue[1]
+        }
+        // descend into nested usrdefun (its body lives in astValue, not leaves)
+        if (t.astType === "usrdefun" && t.astValue && t.astValue.astLeaves !== undefined) {
+            walk(t.astValue, level + 1)
+        }
+        // generic descent
+        if (t.astLeaves) {
+            for (let i = 0; i < t.astLeaves.length; i++) walk(t.astLeaves[i], level)
+        }
+    }
+    walk(body, 0)
+    return maxIdx + 1
+}
+
+// ---------- expression lowering ---------------------------------------------
+
+// `depth` tracks the number of enclosing lambdas during emission. When we
+// emit a lambda we increment it; defun_args [d, i] becomes _aN_i where
+// N = depth - 1 - d  (the absolute lambda index of the binding scope).
+function compileExpr(tree, depth) {
+    if (tree === undefined || tree === null) return "undefined"
+
+    // Empty parens / wrapper node: descend into the single child
+    if (tree.astType === "null") {
+        if (tree.astLeaves && tree.astLeaves[0] !== undefined) return compileExpr(tree.astLeaves[0], depth)
+        return "undefined"
+    }
+    if (tree.astValue === undefined && tree.astLeaves && tree.astLeaves.length === 1) {
+        return compileExpr(tree.astLeaves[0], depth)
+    }
+
+    switch (tree.astType) {
+        case "num":    return String(Number(tree.astValue))
+        case "string": return jsLit(String(tree.astValue))
+        case "bool":   return tree.astValue ? "true" : "false"
+        case "lit":    return compileLit(tree)
+        case "defun_args": {
+            const d = tree.astValue[0], i = tree.astValue[1]
+            const scope = depth - 1 - d
+            if (scope < 0) throw Error("defun_args refers to a scope outside the program (depth=" + depth + ", d=" + d + ")")
+            return "_a" + scope + "_" + i
+        }
+        case "usrdefun": return compileLambdaExpr(tree, depth)
+        case "array":    return compileArrayRef(tree, depth)
+        case "function": return compileFunctionExpr(tree, depth)
+        case "op":       return compileOpExpr(tree, depth)
+        default:
+            throw Error("Cannot compile expression node of type: " + tree.astType + " (value=" + tree.astValue + ")")
+    }
+}
+
+function compileLit(tree) {
+    const name = String(tree.astValue).toUpperCase()
+    // Built-in zero-arg / pass-as-value functions: when a builtin name is
+    // referenced as a value (e.g. assigned to a variable for later use as a
+    // higher-order arg), emit a JS function reference. For a plain variable
+    // read, emit the vars table lookup.
+    // Heuristic: if the name matches a builtin we know about, prefer the
+    // function; otherwise, vars lookup.
+    if (RUNTIME_BUILTINS.has(name)) {
+        return "bS." + (isValidJsId(name) ? name : `[${jsLit(name)}]`)
+    }
+    return varRef(name)
+}
+
+function compileArrayRef(tree, depth) {
+    // tree.astValue = array variable name; tree.astLeaves = index expressions
+    if (!tree.astLeaves || tree.astLeaves.length === 0) {
+        return varRef(tree.astValue)
+    }
+    const indices = tree.astLeaves.map(l => compileExpr(l, depth))
+    return `bS.__arrGet(${varRef(tree.astValue)}, [${indices.join(",")}])`
+}
+
+function compileFunctionExpr(tree, depth) {
+    const name = String(tree.astValue).toUpperCase()
+
+    if (name === "PRINT" || name === "EMIT") {
+        // PRINT/EMIT used as expression — emit as IIFE returning undefined
+        return "(" + compilePrintLike(tree, name, depth) + ", undefined)"
+    }
+    // user function call by name: <varname>(args)  — when astType is "function"
+    // and astValue is a string that matches a variable, the parser may have
+    // generated this. Treat it as: invoke the var.
+    if (!RUNTIME_BUILTINS.has(name)) {
+        // Not a known builtin: treat as a user defined function call
+        const args = (tree.astLeaves || []).map(l => compileExpr(l, depth))
+        return `bS.__runFn(${varRef(name)}, [${args.join(",")}])`
+    }
+
+    const args = (tree.astLeaves || []).map(l => compileExpr(l, depth))
+    return `bS.${isValidJsId(name) ? name : `[${jsLit(name)}]`}(${args.join(",")})`
+}
+
+const ARITH_OP = {
+    "+":  (l,r) => `bS.__add(${l},${r})`,
+    "-":  (l,r) => `((${l})-(${r}))`,
+    "*":  (l,r) => `((${l})*(${r}))`,
+    "/":  (l,r) => `bS.__div(${l},${r})`,
+    "\\": (l,r) => `bS.__intdiv(${l},${r})`,
+    "MOD":(l,r) => `bS.__mod(${l},${r})`,
+    "^":  (l,r) => `bS.__pow(${l},${r})`,
+    "==": (l,r) => `((${l})==(${r}))`,
+    "<>": (l,r) => `((${l})!=(${r}))`,
+    "><": (l,r) => `((${l})!=(${r}))`,
+    "<":  (l,r) => `((${l})<(${r}))`,
+    ">":  (l,r) => `((${l})>(${r}))`,
+    "<=": (l,r) => `((${l})<=(${r}))`,
+    "=<": (l,r) => `((${l})<=(${r}))`,
+    ">=": (l,r) => `((${l})>=(${r}))`,
+    "=>": (l,r) => `((${l})>=(${r}))`,
+    "AND":(l,r) => `bS.AND(${l},${r})`,
+    "OR": (l,r) => `bS.OR(${l},${r})`,
+    "<<": (l,r) => `((${l})<<(${r}))`,
+    ">>": (l,r) => `((${l})>>>(${r}))`,
+    "BAND":(l,r) => `((${l})&(${r}))`,
+    "BOR": (l,r) => `((${l})|(${r}))`,
+    "BXOR":(l,r) => `((${l})^(${r}))`,
+}
+const UNARY_OP = {
+    "UNARYMINUS":   (a) => `(-(${a}))`,
+    "UNARYPLUS":    (a) => `(+(${a}))`,
+    "UNARYLOGICNOT":(a) => `(!(${a}))`,
+    "UNARYBNOT":    (a) => `(~(${a}))`,
+}
+
+function compileOpExpr(tree, depth) {
+    const op = String(tree.astValue)
+    const leaves = tree.astLeaves || []
+
+    // Unary
+    if (UNARY_OP[op] && (leaves.length === 1 || leaves[1] === undefined)) {
+        return UNARY_OP[op](compileExpr(leaves[0], depth))
+    }
+
+    // Binary arithmetic / comparison / logic
+    if (ARITH_OP[op] && leaves.length === 2) {
+        return ARITH_OP[op](compileExpr(leaves[0], depth), compileExpr(leaves[1], depth))
+    }
+
+    // Generator / range
+    if (op === "TO" && leaves.length === 2) {
+        return `new bS.__ForGen(${compileExpr(leaves[0], depth)}, ${compileExpr(leaves[1], depth)}, 1)`
+    }
+    if (op === "STEP" && leaves.length === 2) {
+        return `bS.STEP(${compileExpr(leaves[0], depth)}, ${compileExpr(leaves[1], depth)})`
+    }
+
+    // List ops
+    if ((op === "!" || op === "~" || op === "#") && leaves.length === 2) {
+        const fn = (op === "!") ? "['!']" : (op === "~") ? "['~']" : "['#']"
+        return `bS${fn}(${compileExpr(leaves[0], depth)}, ${compileExpr(leaves[1], depth)})`
+    }
+
+    // Assignment as expression — returns the assigned value
+    if (op === "=" && leaves.length === 2) {
+        return "(" + compileAssignExpr(tree, depth) + ")"
+    }
+    if (op === "IN" && leaves.length === 2) {
+        // Used inside FOR/FOREACH; compileFor unwraps these. As a value, treat
+        // as { asgnVarName, asgnValue } so a stray IN still works.
+        const name = jsLit(String(leaves[0].astValue).toUpperCase())
+        const rhs = compileExpr(leaves[1], depth)
+        return `({asgnVarName: ${name}, asgnValue: ${rhs}})`
+    }
+
+    // Functional / monad ops
+    if ((op === ">>=" || op === ">>~" || op === "." || op === "$" ||
+         op === "&"   || op === "~<"  || op === "<*>" || op === "<$>" ||
+         op === "<~>") && leaves.length === 2) {
+        return `bS[${jsLit(op)}](${compileExpr(leaves[0], depth)}, ${compileExpr(leaves[1], depth)})`
+    }
+    if (op === "@" && leaves.length === 1) {
+        // Monad return as prefix
+        return `bS.MRET(${compileExpr(leaves[0], depth)})`
+    }
+    if (op === "~>") {
+        throw Error("Compiler: bare ~> survived prune (should be usrdefun)")
+    }
+
+    throw Error("Cannot compile op '" + op + "' with " + leaves.length + " operand(s)")
+}
+
+function compileLambdaExpr(tree, depth) {
+    // tree.astType === "usrdefun"; tree.astValue holds the body AST; if
+    // tree.astLeaves is non-empty, this is an immediate application.
+    const body = tree.astValue
+    if (!body || !body.astType) throw Error("Malformed usrdefun")
+
+    const arity = lambdaArity(body)
+    const newDepth = depth + 1
+    const params = []
+    for (let i = 0; i < arity; i++) params.push("_a" + (newDepth - 1) + "_" + i)
+    const bodyJs = compileExpr(body, newDepth)
+    const arrow = `((${params.join(",")}) => (${bodyJs}))`
+
+    if (tree.astLeaves && tree.astLeaves.length > 0) {
+        const args = tree.astLeaves.map(l => compileExpr(l, depth))
+        return `${arrow}(${args.join(",")})`
+    }
+    return arrow
+}
+
+function compileAssignExpr(tree, depth) {
+    // op "=" with leaves[0] as target, leaves[1] as RHS
+    const lhs = tree.astLeaves[0]
+    const rhs = compileExpr(tree.astLeaves[1], depth)
+
+    if (lhs.astType === "lit") {
+        const name = String(lhs.astValue).toUpperCase()
+        return `(${varRef(name)} = ${rhs})`
+    }
+    // The parser emits "function" or "array" for `A(i,j) = ...` — both mean
+    // "store into element of A".
+    if (lhs.astType === "array" || lhs.astType === "function") {
+        const indices = lhs.astLeaves.map(l => compileExpr(l, depth))
+        return `(bS.__arrSet(${varRef(lhs.astValue)}, [${indices.join(",")}], ${rhs}), ${rhs})`
+    }
+    throw Error("Cannot assign to LHS of type " + lhs.astType)
+}
+
+// ---------- statement lowering ----------------------------------------------
+
+function compilePrintLike(tree, fname, depth) {
+    const leaves = (tree.astLeaves || []).slice()
+    const seps = (tree.astSeps || []).slice()
+
+    let suppressNewline = false
+    if (leaves.length > 0 && leaves[leaves.length - 1] !== undefined &&
+        leaves[leaves.length - 1].astType === "null") {
+        suppressNewline = true
+        leaves.pop()
+    }
+
+    const valueExprs = leaves.map(l => compileExpr(l, depth))
+    if (suppressNewline) valueExprs.push("bS.__PRINT_NONL")
+    const sepArr = seps.slice(0, leaves.length - 1)
+
+    return `bS.${fname}([${valueExprs.join(", ")}], ${jsLit(sepArr)})`
+}
+
+function setPc(pc) {
+    if (pc[0] === Infinity) return "pc=[Infinity,0];"
+    return "pc=[" + pc[0] + "," + pc[1] + "];"
+}
+
+function compileStatement(tree, lnum, stmt, nextPc) {
+    if (!tree) return setPc(nextPc)
+    if (tree.astType === "null" && tree.astLeaves && tree.astLeaves[0]) {
+        return compileStatement(tree.astLeaves[0], lnum, stmt, nextPc)
+    }
+
+    const isFn = (tree.astType === "function" || tree.astType === "op")
+    const fname = isFn ? String(tree.astValue).toUpperCase() : null
+
+    switch (fname) {
+    case "GOTO": {
+        const target = compileGotoTarget(tree.astLeaves[0])
+        return `pc=${target};`
+    }
+    case "GOSUB": {
+        const target = compileGotoTarget(tree.astLeaves[0])
+        return `gosubStack.push([${nextPc[0]},${nextPc[1]}]); pc=${target};`
+    }
+    case "RETURN":
+        return `pc=gosubStack.pop(); if(!pc) throw new Error("RETURN without GOSUB");`
+    case "END":
+        return "pc=[Infinity,0];"
+    case "IF":
+        return compileIf(tree, lnum, stmt, nextPc)
+    case "ON":
+        return compileOn(tree, lnum, stmt, nextPc)
+    case "FOR":
+    case "FOREACH":
+        return compileFor(tree, lnum, stmt, nextPc, fname === "FOREACH")
+    case "NEXT":
+        return compileNext(tree, lnum, stmt, nextPc)
+    case "READ": {
+        const target = tree.astLeaves[0]
+        if (target.astType !== "lit") throw Error("READ: target must be a variable")
+        return `${varRef(target.astValue)}=bS.__readData(); ${setPc(nextPc)}`
+    }
+    case "RESTORE":
+        return `bS.__state.dataCursor=0; ${setPc(nextPc)}`
+    case "DATA":
+    case "LABEL":
+        return setPc(nextPc) // harvested at compile time
+    case "DIM":
+        return compileDim(tree, lnum, stmt, nextPc)
+    case "PRINT":
+    case "EMIT":
+        return `${compilePrintLike(tree, fname, 0)}; ${setPc(nextPc)}`
+    case "OPTIONBASE":
+        return `bS.OPTIONBASE(${compileExpr(tree.astLeaves[0], 0)}); ${setPc(nextPc)}`
+    case "OPTIONDEBUG":
+        return `bS.OPTIONDEBUG(${compileExpr(tree.astLeaves[0], 0)}); ${setPc(nextPc)}`
+    case "OPTIONTRACE":
+        return `bS.OPTIONTRACE(${compileExpr(tree.astLeaves[0], 0)}); ${setPc(nextPc)}`
+    case "INPUT": {
+        // INPUT <var> -> read into var
+        const target = tree.astLeaves[tree.astLeaves.length - 1]
+        if (target.astType !== "lit") throw Error("INPUT: target must be a variable")
+        return `${varRef(target.astValue)}=bS.INPUT(); ${setPc(nextPc)}`
+    }
+    case "=":
+        return `${compileAssignExpr(tree, 0)}; ${setPc(nextPc)}`
+    case "IN":
+        // bare IN as a statement is unusual but harmless
+        return `${compileExpr(tree, 0)}; ${setPc(nextPc)}`
+    case "REM":
+        return setPc(nextPc)
+    }
+
+    // Default: evaluate as an expression for side effect, then advance
+    return `${compileExpr(tree, 0)}; ${setPc(nextPc)}`
+}
+
+function compileGotoTarget(leaf) {
+    // Always route through __resolveTarget so non-existent line numbers snap
+    // upward to the next existing line — matching basic.js's main loop,
+    // which increments lnum until it finds a populated cmdbuf entry.
+    if (leaf.astType === "num") return `bS.__resolveTarget(${Number(leaf.astValue)})`
+    if (leaf.astType === "string") return `bS.__resolveTarget(${jsLit(leaf.astValue)})`
+    if (leaf.astType === "lit") {
+        const name = String(leaf.astValue)
+        return `bS.__resolveTarget(bS.__state.gotoLabels[${jsLit(name)}]!==undefined ? ${jsLit(name)} : ${varRef(name)})`
+    }
+    return `bS.__resolveTarget(${compileExpr(leaf, 0)})`
+}
+
+function compileIf(tree, lnum, stmt, nextPc) {
+    const test = compileExpr(tree.astLeaves[0], 0)
+    const thenStmt = compileStatement(tree.astLeaves[1], lnum, stmt, nextPc)
+    const elseStmt = (tree.astLeaves[2])
+        ? compileStatement(tree.astLeaves[2], lnum, stmt, nextPc)
+        : setPc(nextPc)
+    return `if(bS.__test(${test})){${thenStmt}}else{${elseStmt}}`
+}
+
+function compileOn(tree, lnum, stmt, nextPc) {
+    // children: testExpr, jumpFnLit, target0, target1, ...
+    const testExpr = compileExpr(tree.astLeaves[0], 0)
+    const jmpFn    = String(tree.astLeaves[1].astValue).toUpperCase()
+    const targets  = tree.astLeaves.slice(2)
+
+    const cases = targets.map((t, i) => {
+        const tgt = compileGotoTarget(t)
+        if (jmpFn === "GOSUB") {
+            return `case ${i}: gosubStack.push([${nextPc[0]},${nextPc[1]}]); pc=${tgt}; break;`
+        }
+        return `case ${i}: pc=${tgt}; break;`
+    })
+    return `{const _o=(${testExpr})-bS.__state.indexBase; switch(_o){${cases.join(" ")} default: ${setPc(nextPc)}}}`
+}
+
+function compileFor(tree, lnum, stmt, nextPc, isForEach) {
+    const child = tree.astLeaves[0]
+    if (child.astType !== "op" || (child.astValue !== "=" && child.astValue !== "IN")) {
+        throw Error("FOR/FOREACH: expected = or IN, got " + child.astType + ":" + child.astValue)
+    }
+    const varname = String(child.astLeaves[0].astValue).toUpperCase()
+    let iter = compileExpr(child.astLeaves[1], 0)
+    if (isForEach) {
+        // ensure we coerce generators into arrays for FOREACH semantics
+        iter = `(function(_x){return bS.__isGenerator(_x)?bS.__genToArray(_x):_x})(${iter})`
+    }
+    // Pass nextPc — the PC of the loop body's first statement — so NEXT can
+    // jump straight back without relying on fall-through.
+    return `bS.__forSetup(${jsLit(varname)}, ${iter}, ${nextPc[0]}, ${nextPc[1]}); ${setPc(nextPc)}`
+}
+
+function compileNext(tree, lnum, stmt, nextPc) {
+    let argExpr = "undefined"
+    const leaves = tree.astLeaves || []
+    if (leaves.length === 1 && leaves[0] && leaves[0].astType === "lit") {
+        argExpr = jsLit(String(leaves[0].astValue).toUpperCase())
+    }
+    return `{const _n=bS.__forNext(${argExpr}); if(_n){pc=_n;}else{${setPc(nextPc)}}}`
+}
+
+function compileDim(tree, lnum, stmt, nextPc) {
+    // tree.astLeaves contains array constructor calls: each leaf is either
+    //   an `array` node OR a `function` node (the parser doesn't distinguish
+    //   `A(5)` from a function call until runtime). astValue is the variable
+    //   name and astLeaves are the dimension expressions.
+    const stmts = []
+    for (let i = 0; i < tree.astLeaves.length; i++) {
+        const leaf = tree.astLeaves[i]
+        if (leaf.astType !== "array" && leaf.astType !== "function") {
+            throw Error("DIM: expected array decl, got " + leaf.astType)
+        }
+        const name = String(leaf.astValue).toUpperCase()
+        const dims = leaf.astLeaves.map(l => compileExpr(l, 0))
+        stmts.push(`${varRef(name)}=bS.__dim([${dims.join(",")}]);`)
+    }
+    return stmts.join(" ") + " " + setPc(nextPc)
+}
+
+// ---------- top-level entry --------------------------------------------------
+
+// Set of builtin names exposed by tbas.mjs. Used to decide whether a `lit`
+// in expression position is a variable or a function reference.
+const RUNTIME_BUILTINS = new Set([
+    "PRINT","EMIT","INPUT","CIN",
+    "ABS","SGN","INT","FLOOR","CEIL","FIX","ROUND","SQR","CBR",
+    "SIN","COS","TAN","ASN","ACO","ATN","SINH","COSH","TANH",
+    "EXP","LOG","MIN","MAX","RND",
+    "SPC","LEFT","RIGHT","MID","CHR",
+    "LEN","HEAD","TAIL","INIT","LAST","MAP","FOLD","FILTER","ARRAY",
+    "CLS","CLPX","PLOT","GOTOYX","TEXTFORE","TEXTBACK",
+    "POKE","PEEK","GETKEYSDOWN","CPUT","CGET","CSTA",
+    "TYPEOF","OPTIONBASE","OPTIONDEBUG","OPTIONTRACE",
+    "MRET","MLIST","MJOIN",
+    "AND","OR","NOT",
+    "DO","CLEAR","END","TO","STEP",
+    "FOR","FOREACH","NEXT","IF","ON","GOTO","GOSUB","RETURN",
+    "DIM","DATA","READ","RESTORE","LABEL","REM",
+    "TEST",
+])
+
+bS._compileImpl = function(outpath) {
+    if (typeof cmdbuf === "undefined") throw Error("compile.js: cmdbuf not available")
+    if (typeof bF === "undefined")     throw Error("compile.js: bF not available")
+    if (typeof bF._interpretLine !== "function") throw Error("compile.js: bF._interpretLine not available")
+
+    // Reset parser-side state so we don't pollute the live interpreter
+    if (typeof lambdaBoundVars !== "undefined") lambdaBoundVars.length = 0
+    const savedPrescan = (typeof prescan !== "undefined") ? prescan : false
+    if (typeof prescan !== "undefined") prescan = true   // suppress execution of LABEL/DATA prescan side-effects
+
+    // ---- pass 1: parse every line ----
+    const programTrees = []   // [lnum] -> array of statements
+    for (let lnum = 0; lnum < cmdbuf.length; lnum++) {
+        const linestr = cmdbuf[lnum]
+        if (linestr === undefined) continue
+        const trees = bF._interpretLine(lnum, String(linestr).trim())
+        if (trees !== undefined) programTrees[lnum] = trees
+    }
+    if (typeof prescan !== "undefined") prescan = savedPrescan
+
+    // ---- pass 2: ordered list of populated lnums and successor table ----
+    const linenums = []
+    for (let lnum = 0; lnum < programTrees.length; lnum++) {
+        if (programTrees[lnum] !== undefined) linenums.push(lnum)
+    }
+
+    function nextPcOf(idx, stmtIdx) {
+        const lnum = linenums[idx]
+        const stmts = programTrees[lnum]
+        if (stmtIdx + 1 < stmts.length) return [lnum, stmtIdx + 1]
+        if (idx + 1 < linenums.length)  return [linenums[idx + 1], 0]
+        return [Infinity, 0]
+    }
+
+    // ---- pass 3: harvest DATA constants and LABEL definitions ----
+    const dataConsts = []
+    const labelMap = {}
+    for (let i = 0; i < linenums.length; i++) {
+        const lnum = linenums[i]
+        const stmts = programTrees[lnum]
+        for (let s = 0; s < stmts.length; s++) {
+            const t = stmts[s]
+            if (!t) continue
+            if (t.astValue === "DATA") {
+                for (let k = 0; k < t.astLeaves.length; k++) {
+                    dataConsts.push(literalValue(t.astLeaves[k]))
+                }
+            } else if (t.astValue === "LABEL") {
+                const lblNode = t.astLeaves[0]
+                if (!lblNode) throw Error("LABEL with no name on line " + lnum)
+                const lblName = String(lblNode.astValue)
+                labelMap[lblName] = [lnum, s]
+            }
+        }
+    }
+
+    // ---- pass 4: emit case bodies ----
+    const cases = []
+    for (let i = 0; i < linenums.length; i++) {
+        const lnum = linenums[i]
+        const stmts = programTrees[lnum]
+        for (let s = 0; s < stmts.length; s++) {
+            const next = nextPcOf(i, s)
+            const body = compileStatement(stmts[s], lnum, s, next)
+            cases.push(`    case ${lnum}*32+${s}: { ${body} break; }`)
+        }
+    }
+
+    // ---- pass 5: assemble final output ----
+    const firstPc = (linenums.length > 0) ? `[${linenums[0]},0]` : `[Infinity,0]`
+    const labelMapJs = "{" + Object.keys(labelMap).map(k =>
+        `${jsLit(k)}: [${labelMap[k][0]}, ${labelMap[k][1]}]`
+    ).join(", ") + "}"
+
+    const out =
+`// Compiled by Terran BASIC -> JS compiler (assets/disk0/tbas/compile.js)
+// Source line count: ${linenums.length}
+let bS = require("tbas")
+bS.__reset()
+bS.__data(${jsLit(dataConsts)})
+bS.__labels(${labelMapJs})
+bS.__setLines(${jsLit(linenums)})
+let pc = ${firstPc}
+const gosubStack = []
+while (pc[0] !== Infinity) {
+  switch (pc[0]*32 + pc[1]) {
+${cases.join("\n")}
+    default: pc = [Infinity, 0]; break;
+  }
+}
+`
+
+    // ---- write to disk via basic.js's fs (writes under BASIC_HOME_PATH) ----
+    const opened = fs.open(outpath, "W")
+    if (!opened) throw Error("Cannot open " + outpath + " for writing")
+    fs.write(out)
+    return out.length
+}
+
+})();
--- a/assets/disk0/tracker_test.js
+++ b/assets/disk0/tracker_test.js
@@ -19,9 +19,9 @@ var Note = (function() {
            if (flats[s] !== names[s]) t[flats[s] + oct] = n(oct, s);
        }
    }
-    t.OFF = 0x0000;   // key-off
-    t.CUT = 0xFFFE;   // note cut (immediate)
-    t.NOP = 0xFFFF;   // no-op (empty row)
+    t.NOP = 0x0000;   // no-op (empty row)
+    t.OFF = 0x0001;   // key-off
+    t.CUT = 0x0002;   // note cut (immediate)
    return t;
 }());

--- a/assets/disk0/tvdos/TVDOS.SYS
+++ b/assets/disk0/tvdos/TVDOS.SYS
@@ -147,10 +147,12 @@ _TVDOS.variables = {
    LANG: "EN",
    KEYBOARD: "us_qwerty",
    PATH: "\\tvdos\\bin;\\home",
+    INCLPATH: "\\tvdos\\include;\\home",
    PATHEXT: ".com;.bat;.app;.js;.alias",
    HELPPATH: "\\tvdos\\help",
    OS_NAME: "TSVM Disk Operating System",
-    OS_VERSION: _TVDOS.VERSION
+    OS_VERSION: _TVDOS.VERSION,
+    USERCONFIGPATH: "\\home\\config",
 };
 Object.freeze(_TVDOS);

@@ -1405,9 +1407,6 @@ let requireFromMemory = (ptr) => {
 }*/


-var GL = require("A:/tvdos/include/gl.mjs")
-
-
 // @param cmdsrc JS source code
 // @param args arguments for the program, must be Array, and args[0] is always the name of the program, e.g.
 //        for command line 'echo foo bar', args[0] must be 'echo'
@@ -1420,7 +1419,7 @@ var execApp = (cmdsrc, args, appname) => {
 `var ${appname}=function(exec_args){${injectIntChk(cmdsrc, intchkFunName)}\n};` +
 `${appname}`); // making 'exec_args' a app-level global

-        execAppPrg(args);
+        return execAppPrg(args);
 }


--- a/assets/disk0/tvdos/bin/command.js
+++ b/assets/disk0/tvdos/bin/command.js
@@ -577,6 +577,59 @@ shell.coreutils = {
    ver: function(args) {
        println(welcome_text)
    },
+    which: function(args) {
+        if (args[1] === undefined) {
+            printerrln(`Usage: ${args[0].toUpperCase()} program_name`)
+            return 1
+        }
+        let cmd = args[1]
+
+        if (shell.coreutils[cmd.toLowerCase()] !== undefined) {
+            println(`${cmd}: shell built-in command`)
+            return 0
+        }
+
+        var fileExists = false
+        var searchFile
+        var searchPath = ""
+
+        if (shell.isValidDriveLetter(cmd[0]) && cmd[1] == ':') {
+            searchFile = files.open(cmd)
+            searchPath = trimStartRevSlash(searchFile.path)
+            fileExists = searchFile.exists
+        }
+        else {
+            var searchDir = (cmd.startsWith("/")) ? [""] : ["/"+shell_pwd.join("/")].concat(_TVDOS.getPath())
+
+            var pathExt = []
+            if (cmd.split(".")[1] === undefined)
+                _TVDOS.variables.PATHEXT.split(';').forEach(function(it) { pathExt.push(it); pathExt.push(it.toUpperCase()); })
+            else
+                pathExt.push("")
+
+            searchLoop:
+            for (var i = 0; i < searchDir.length; i++) {
+                for (var j = 0; j < pathExt.length; j++) {
+                    let search = searchDir[i]; if (!search.endsWith('\\')) search += '\\'
+                    searchPath = trimStartRevSlash(search + cmd + pathExt[j])
+
+                    searchFile = files.open(`${CURRENT_DRIVE}:\\${searchPath}`)
+                    if (searchFile.exists) {
+                        fileExists = true
+                        break searchLoop
+                    }
+                }
+            }
+        }
+
+        if (!fileExists) {
+            printerrln(`${cmd}: not found`)
+            return 1
+        }
+
+        println(searchFile.fullPath)
+        return 0
+    },
    panic: function(args) {
        throw Error("Panicking command.js")
    }
@@ -590,6 +643,7 @@ shell.coreutils.ls = shell.coreutils.dir
 shell.coreutils.time = shell.coreutils.date
 shell.coreutils.md = shell.coreutils.mkdir
 shell.coreutils.move = shell.coreutils.mv
+shell.coreutils.where = shell.coreutils.which
 // end of command aliases
 Object.freeze(shell.coreutils)
 shell.stdio = {
@@ -614,13 +668,25 @@ require = function(path) {
    if (path[1] == ":") return shell.require(path)
    else {
        // if the path starts with ".", look for the current directory
-        // if the path starts with [A-Za-z0-9], look for the DOSDIR/includes
+        // if the path starts with [A-Za-z0-9], search through INCLPATH
        if (path[0] == '.') return shell.require(shell.resolvePathInput(path).full + ".mjs")
-        else return shell.require(`A:${_TVDOS.variables.DOSDIR}/include/${path}.mjs`)
+        else {
+            let inclDirs = (_TVDOS.variables.INCLPATH || "").split(';').filter(function(it) { return it.length > 0 })
+            for (let i = 0; i < inclDirs.length; i++) {
+                let dir = inclDirs[i]
+                if (!dir.endsWith('\\') && !dir.endsWith('/')) dir += '\\'
+                let candidate = `${CURRENT_DRIVE}:${dir}${path}.mjs`
+                if (files.open(candidate).exists) return shell.require(candidate)
+            }
+            // no match found; defer to shell.require with the first entry so the error mentions a sensible path
+            let firstDir = inclDirs[0] || `${_TVDOS.variables.DOSDIR}\\include`
+            if (!firstDir.endsWith('\\') && !firstDir.endsWith('/')) firstDir += '\\'
+            return shell.require(`${CURRENT_DRIVE}:${firstDir}${path}.mjs`)
+        }
    }
 }

-shell.execute = function(line) {
+shell.execute = function(line, nameOverride) {
    if (0 == line.size) return
    let parsedTokens = shell.parse(line) // echo, "hai", |, less
    let statements = [] // [[echo, "hai"], [less]]
@@ -757,19 +823,28 @@ shell.execute = function(line) {
                    // parse alias
                    // $0: all arguments
                    // $1..9: specific arguments
+                    // Tokens that contain whitespace or shell metacharacters must be re-quoted
+                    // before re-execution, otherwise the re-parse splits them on spaces.
+                    var quoteAliasArg = function(s) {
+                        if (s === undefined || s === null) return ""
+                        s = ''+s
+                        if (s.length === 0) return ""
+                        if (/[\s"|><&]/.test(s)) return '"' + s.replaceAll('"', '^"') + '"'
+                        return s
+                    }
                    var lines = programCode.split('\n').filter(function(it) { return it.length > 0 }) // this return is not shell's return!
                    lines.forEach(function(line) {
                        var newLine = line

                        // replace $1..$9
-                        for (let j = 1; j < 9; j++) {
-                            newLine = newLine.replaceAll('$'+j, tokens[j])
+                        for (let j = 1; j <= 9; j++) {
+                            newLine = newLine.replaceAll('$'+j, quoteAliasArg(tokens[j]))
                        }

                        // replace $0
-                        newLine = newLine.replaceAll('$0', tokens.slice(1).join(' '))
+                        newLine = newLine.replaceAll('$0', tokens.slice(1).map(quoteAliasArg).join(' '))

-                        shell.execute(newLine)
+                        shell.execute(newLine, cmd)
                    })
                }
                else if ("APP" == extension) {
@@ -786,6 +861,10 @@ shell.execute = function(line) {
                        errorlevel = 0 // reset the number

                        if (_G.shellProgramTitles === undefined) _G.shellProgramTitles = []
+                        if (nameOverride !== undefined) {
+                            tokens[0] = (''+nameOverride)
+                            cmd = tokens[0]
+                        }
                        _G.shellProgramTitles.push(cmd.toUpperCase())
                        sendLcdMsg(_G.shellProgramTitles[_G.shellProgramTitles.length - 1])
                        //serial.println(_G.shellProgramTitles)
@@ -885,6 +964,18 @@ _G.shell = shell

 ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

+// ensure USERCONFIGPATH directory exists
+try {
+    let userConfigPath = `${CURRENT_DRIVE}:${_TVDOS.variables.USERCONFIGPATH}`
+    let userConfigDir = files.open(userConfigPath)
+    if (!userConfigDir.exists) {
+        debugprintln(`command.js > creating USERCONFIGPATH at ${userConfigPath}`)
+        userConfigDir.mkDir()
+    }
+} catch (e) {
+    debugprintln("command.js > USERCONFIGPATH creation failed: " + e.message)
+}
+
 if (exec_args[1] !== undefined) {
    // only meaningful switches would be either -c or -k anyway
    var firstSwitch = exec_args[1].toLowerCase()
--- a/assets/disk0/tvdos/bin/playucf.js
+++ b/assets/disk0/tvdos/bin/playucf.js
@@ -307,7 +307,7 @@ for (let i = 0; i < cueElements.length; i++) {
            // Execute the player with modified environment
            exec_args[1] = targetPath
            if (playerFile) {
-                let playerPath = `A:\\tvdos\\bin\\${playerFile}.js`
+                let playerPath = `A:${_TVDOS.variables.DOSDIR}/bin/${playerFile}.js`
                if (files.open(playerPath).exists) {
                    eval(files.readText(playerPath))
                } else {
@@ -334,7 +334,7 @@ for (let i = 0; i < cueElements.length; i++) {
    }

    // Execute the appropriate player
-    let playerPath = `A:\\tvdos\\bin\\${playerFile}.js`
+    let playerPath = `A:${_TVDOS.variables.DOSDIR}/bin/${playerFile}.js`
    if (!files.open(playerPath).exists) {
        serial.println(`Warning: Player script not found: ${playerPath}`)
        continue
--- a/assets/disk0/tvdos/bin/taut.js
+++ b/assets/disk0/tvdos/bin/taut.js
@@ -169,61 +169,63 @@ const volFxNames = {

 const pitchTablePresets = {
 // index: pitch table number to be recorded on .taudproj file
-0:{index:0,name:"Raw format",table:[],interval:0x1000,sym:[]}, // when null is specified, hex numbers will be displayed instead
+// t: type of the tuning. M - Macrotonal, m - microtonal, d - 12-tone
+    
+0:{index:0,name:"Raw format",table:[],interval:0x1000,t:'',sym:[]}, // when null is specified, hex numbers will be displayed instead
 /* Xenharmonic, equal temperament */
-10:{index:10,name:"Octave only", table:[0x0],interval:0x1000,
+10:{index:10,name:"Octave only",table:[0x0],interval:0x1000,t:'M',
 sym:[`C${sym.accnull}`]},
-20:{index:20,name:"2-TET", table:[0x0,0x800],interval:0x1000,
+20:{index:20,name:"2-TET",table:[0x0,0x800],interval:0x1000,t:'M',
 sym:[`C${sym.accnull}`,`F${sym.sharp}`]},
-30:{index:30,name:"3-TET", table:[0x0,0x555,0xAAB],interval:0x1000,
+30:{index:30,name:"3-TET",table:[0x0,0x555,0xAAB],interval:0x1000,t:'M',
 sym:[`C${sym.accnull}`,`E${sym.accnull}`,`G${sym.sharp}`]},
-40:{index:40,name:"4-TET", table:[0x0,0x400,0x800,0xC00],interval:0x1000,
+40:{index:40,name:"4-TET",table:[0x0,0x400,0x800,0xC00],interval:0x1000,t:'M',
 sym:[`C${sym.accnull}`,`D${sym.sharp}`,`F${sym.sharp}`,`A${sym.accnull}`]},
-50:{index:50,name:"5-TET", table:[0x0,0x333,0x666,0x99A,0xCCD],interval:0x1000,
+50:{index:50,name:"5-TET",table:[0x0,0x333,0x666,0x99A,0xCCD],interval:0x1000,t:'M',
 sym:[`C${sym.accnull}`,`D${sym.accnull}`,`E${sym.accnull}`,`G${sym.accnull}`,`A${sym.accnull}`]},
-60:{index:60,name:"6-TET", table:[0x0,0x2AB,0x555,0x800,0xAAB,0xD55],interval:0x1000,
+60:{index:60,name:"6-TET",table:[0x0,0x2AB,0x555,0x800,0xAAB,0xD55],interval:0x1000,t:'M',
 sym:[`C${sym.accnull}`,`D${sym.accnull}`,`E${sym.accnull}`,`F${sym.sharp}`,`G${sym.sharp}`,`A${sym.sharp}`]},
-70:{index:70,name:"7-TET", table:[0x0,0x249,0x492,0x6DB,0x925,0xB6E,0xDB7],interval:0x1000,
+70:{index:70,name:"7-TET",table:[0x0,0x249,0x492,0x6DB,0x925,0xB6E,0xDB7],interval:0x1000,t:'M',
 sym:[`C${sym.accnull}`,`D${sym.accnull}`,`E${sym.accnull}`,`F${sym.accnull}`,`G${sym.accnull}`,`A${sym.accnull}`,`B${sym.accnull}`]},
-80:{index:80,name:"8-TET", table:[0x0,0x200,0x400,0x600,0x800,0xA00,0xC00,0xE00],interval:0x1000,
+80:{index:80,name:"8-TET",table:[0x0,0x200,0x400,0x600,0x800,0xA00,0xC00,0xE00],interval:0x1000,t:'M',
 sym:[`C${sym.accnull}`,`D${sym.accnull}`,`E${sym.accnull}`,`F${sym.accnull}`,`F${sym.sharp}`,`G${sym.sharp}`,`A${sym.accnull}`,`B${sym.accnull}`]},
-90:{index:90,name:"9-TET", table:[0x0,0x1C7,0x38E,0x555,0x71C,0x8E4,0xAAB,0xC72,0xE39],interval:0x1000,
+90:{index:90,name:"9-TET",table:[0x0,0x1C7,0x38E,0x555,0x71C,0x8E4,0xAAB,0xC72,0xE39],interval:0x1000,t:'M',
 sym:[`C${sym.accnull}`,`D${sym.accnull}`,`E${sym.accnull}`,`E${sym.sharp}`,`F${sym.accnull}`,`G${sym.accnull}`,`A${sym.accnull}`,`B${sym.accnull}`,`B${sym.sharp}`]},
-100:{index:100,name:"10-TET", table:[0x0,0x19A,0x333,0x4CD,0x666,0x800,0x99A,0xB33,0xCCD,0xE66],interval:0x1000,
+100:{index:100,name:"10-TET",table:[0x0,0x19A,0x333,0x4CD,0x666,0x800,0x99A,0xB33,0xCCD,0xE66],interval:0x1000,t:'M',
 sym:[`C${sym.accnull}`,`D${sym.flat}`,`D${sym.accnull}`,`E${sym.flat}`,`E${sym.accnull}`,`E${sym.sharp}`,`G${sym.accnull}`,`G${sym.sharp}`,`A${sym.accnull}`,`A${sym.sharp}`]},
-150:{index:150,name:"15-TET", table:[0x0,0x111,0x222,0x333,0x444,0x555,0x666,0x777,0x889,0x99A,0xAAB,0xBBC,0xCCD,0xDDE,0xEEF],interval:0x1000,
+150:{index:150,name:"15-TET",table:[0x0,0x111,0x222,0x333,0x444,0x555,0x666,0x777,0x889,0x99A,0xAAB,0xBBC,0xCCD,0xDDE,0xEEF],interval:0x1000,t:'m',
 sym:[`C${sym.accnull}`,`C${sym.sharp}`,`D${sym.accnull}`,`D${sym.sharp}`,`E${sym.flat}`,`E${sym.accnull}`,`E${sym.sharp}`,`F${sym.sharp}`,`G${sym.accnull}`,`G${sym.sharp}`,`A${sym.flat}`,`A${sym.accnull}`,`A${sym.sharp}`,`B${sym.flat}`,`B${sym.accnull}`]},
-160:{index:160,name:"16-TET", table:[0x0,0x100,0x200,0x300,0x400,0x500,0x600,0x700,0x800,0x900,0xA00,0xB00,0xC00,0xD00,0xE00,0xF00],interval:0x1000,
+160:{index:160,name:"16-TET",table:[0x0,0x100,0x200,0x300,0x400,0x500,0x600,0x700,0x800,0x900,0xA00,0xB00,0xC00,0xD00,0xE00,0xF00],interval:0x1000,t:'m',
 sym:[`C${sym.accnull}`,`C${sym.sharp}`,`D${sym.accnull}`,`D${sym.sharp}`,`E${sym.accnull}`,`E${sym.sharp}`,`F${sym.flat}`,`F${sym.accnull}`,`F${sym.sharp}`,`G${sym.accnull}`,`G${sym.sharp}`,`A${sym.accnull}`,`A${sym.sharp}`,`B${sym.accnull}`,`B${sym.sharp}`,`C${sym.flat}`]},
-170:{index:170,name:"17-TET", table:[0x0,0xF1,0x1E2,0x2D3,0x3C4,0x4B5,0x5A6,0x697,0x788,0x878,0x969,0xA5A,0xB4B,0xC3C,0xD2D,0xE1E,0xF0F],interval:0x1000,
+170:{index:170,name:"17-TET",table:[0x0,0xF1,0x1E2,0x2D3,0x3C4,0x4B5,0x5A6,0x697,0x788,0x878,0x969,0xA5A,0xB4B,0xC3C,0xD2D,0xE1E,0xF0F],interval:0x1000,t:'m',
 sym:[`C${sym.accnull}`,`D${sym.flat}`,`C${sym.sharp}`,`D${sym.accnull}`,`E${sym.flat}`,`D${sym.sharp}`,`E${sym.accnull}`,`F${sym.accnull}`,`G${sym.flat}`,`F${sym.sharp}`,`G${sym.accnull}`,`A${sym.flat}`,`G${sym.sharp}`,`A${sym.accnull}`,`B${sym.flat}`,`A${sym.sharp}`,`B${sym.accnull}`]},
-190:{index:190,name:"19-TET", table:[0x0,0xD8,0x1AF,0x287,0x35E,0x436,0x50D,0x5E5,0x6BD,0x794,0x86C,0x943,0xA1B,0xAF3,0xBCA,0xCA2,0xD79,0xE51,0xF28],interval:0x1000,
+190:{index:190,name:"19-TET",table:[0x0,0xD8,0x1AF,0x287,0x35E,0x436,0x50D,0x5E5,0x6BD,0x794,0x86C,0x943,0xA1B,0xAF3,0xBCA,0xCA2,0xD79,0xE51,0xF28],interval:0x1000,t:'m',
 sym:[`C${sym.accnull}`,`C${sym.sharp}`,`D${sym.flat}`,`D${sym.accnull}`,`D${sym.sharp}`,`E${sym.flat}`,`E${sym.accnull}`,`E${sym.sharp}`,`F${sym.accnull}`,`F${sym.sharp}`,`G${sym.flat}`,`G${sym.accnull}`,`G${sym.sharp}`,`A${sym.flat}`,`A${sym.accnull}`,`A${sym.sharp}`,`B${sym.flat}`,`B${sym.accnull}`,`B${sym.sharp}`]},
-220:{index:220,name:"22-TET", table:[0x0,0xBA,0x174,0x22F,0x2E9,0x3A3,0x45D,0x517,0x5D1,0x68C,0x746,0x800,0x8BA,0x974,0xA2F,0xAE9,0xBA3,0xC5D,0xD17,0xDD1,0xE8C,0xF46],interval:0x1000,
+220:{index:220,name:"22-TET",table:[0x0,0xBA,0x174,0x22F,0x2E9,0x3A3,0x45D,0x517,0x5D1,0x68C,0x746,0x800,0x8BA,0x974,0xA2F,0xAE9,0xBA3,0xC5D,0xD17,0xDD1,0xE8C,0xF46],interval:0x1000,t:'m',
 sym:[`C${sym.accnull}`,`C${sym.demisharp}`,`C${sym.sharp}`,`D${sym.demiflat}`,`D${sym.accnull}`,`D${sym.demisharp}`,`D${sym.sharp}`,`E${sym.demiflat}`,`E${sym.accnull}`,`F${sym.accnull}`,`F${sym.demisharp}`,`F${sym.sharp}`,`G${sym.demiflat}`,`G${sym.accnull}`,`G${sym.demisharp}`,`G${sym.sharp}`,`A${sym.demiflat}`,`A${sym.accnull}`,`A${sym.demisharp}`,`A${sym.sharp}`,`B${sym.demiflat}`,`B${sym.accnull}`]},
-240:{index:240,name:"24-TET", table:[0x0,0xAB,0x155,0x200,0x2AB,0x355,0x400,0x4AB,0x555,0x600,0x6AB,0x755,0x800,0x8AB,0x955,0xA00,0xAAB,0xB55,0xC00,0xCAB,0xD55,0xE00,0xEAB,0xF55],interval:0x1000,
+240:{index:240,name:"24-TET",table:[0x0,0xAB,0x155,0x200,0x2AB,0x355,0x400,0x4AB,0x555,0x600,0x6AB,0x755,0x800,0x8AB,0x955,0xA00,0xAAB,0xB55,0xC00,0xCAB,0xD55,0xE00,0xEAB,0xF55],interval:0x1000,t:'m',
 sym:[`C${sym.accnull}`,`C${sym.demisharp}`,`C${sym.sharp}`,`D${sym.demiflat}`,`D${sym.accnull}`,`D${sym.demisharp}`,`D${sym.sharp}`,`E${sym.demiflat}`,`E${sym.accnull}`,`E${sym.demisharp}`,`F${sym.accnull}`,`F${sym.demisharp}`,`F${sym.sharp}`,`G${sym.demiflat}`,`G${sym.accnull}`,`G${sym.demisharp}`,`G${sym.sharp}`,`A${sym.demiflat}`,`A${sym.accnull}`,`A${sym.demisharp}`,`A${sym.sharp}`,`B${sym.demiflat}`,`B${sym.accnull}`,`B${sym.demisharp}`]},
-310:{index:310,name:"31-TET", table:[0x0,0x84,0x108,0x18C,0x211,0x295,0x319,0x39D,0x421,0x4A5,0x529,0x5AD,0x632,0x6B6,0x73A,0x7BE,0x842,0x8C6,0x94A,0x9CE,0xA53,0xAD7,0xB5B,0xBDF,0xC63,0xCE7,0xD6B,0xDEF,0xE74,0xEF8,0xF7C],interval:0x1000,
+310:{index:310,name:"31-TET",table:[0x0,0x84,0x108,0x18C,0x211,0x295,0x319,0x39D,0x421,0x4A5,0x529,0x5AD,0x632,0x6B6,0x73A,0x7BE,0x842,0x8C6,0x94A,0x9CE,0xA53,0xAD7,0xB5B,0xBDF,0xC63,0xCE7,0xD6B,0xDEF,0xE74,0xEF8,0xF7C],interval:0x1000,t:'m',
 sym:[`C${sym.accnull}`,`C${sym.demisharp}`,`C${sym.sharp}`,`D${sym.flat}`,`D${sym.demiflat}`,`D${sym.accnull}`,`D${sym.demisharp}`,`D${sym.sharp}`,`E${sym.flat}`,`E${sym.demiflat}`,`E${sym.accnull}`,`E${sym.demisharp}`,`F${sym.demiflat}`,`F${sym.accnull}`,`F${sym.demisharp}`,`F${sym.sharp}`,`G${sym.flat}`,`G${sym.demiflat}`,`G${sym.accnull}`,`G${sym.demisharp}`,`G${sym.sharp}`,`A${sym.flat}`,`A${sym.demiflat}`,`A${sym.accnull}`,`A${sym.demisharp}`,`A${sym.sharp}`,`B${sym.flat}`,`B${sym.demiflat}`,`B${sym.accnull}`,`B${sym.demisharp}`,`C${sym.demiflat}`]},
-410:{index:410,name:"41-TET (Kite)", table:[0x0,0x64,0xC8,0x12C,0x190,0x1F4,0x257,0x2BB,0x31F,0x383,0x3E7,0x44B,0x4AF,0x513,0x577,0x5DB,0x63E,0x6A2,0x706,0x76A,0x7CE,0x832,0x896,0x8FA,0x95E,0x9C2,0xA25,0xA89,0xAED,0xB51,0xBB5,0xC19,0xC7D,0xCE1,0xD45,0xDA9,0xE0C,0xE70,0xED4,0xF38,0xF9C],interval:0x1000,
+410:{index:410,name:"41-TET (Kite)",table:[0x0,0x64,0xC8,0x12C,0x190,0x1F4,0x257,0x2BB,0x31F,0x383,0x3E7,0x44B,0x4AF,0x513,0x577,0x5DB,0x63E,0x6A2,0x706,0x76A,0x7CE,0x832,0x896,0x8FA,0x95E,0x9C2,0xA25,0xA89,0xAED,0xB51,0xBB5,0xC19,0xC7D,0xCE1,0xD45,0xDA9,0xE0C,0xE70,0xED4,0xF38,0xF9C],interval:0x1000,t:'m',
 sym:[`${BIGDOT}C-`,`${sym.uptick}C-`,`${sym.doubledntick}C${sym.csharp}`,`${sym.dntick}C${sym.csharp}`,`${BIGDOT}C${sym.csharp}`,`${sym.uptick}C${sym.csharp}`,`${sym.dntick}D-`,`${BIGDOT}D-`,`${sym.uptick}D-`,`${sym.doubledntick}D${sym.csharp}`,`${sym.dntick}D${sym.csharp}`,`${BIGDOT}D${sym.csharp}`,`${sym.uptick}D${sym.csharp}`,`${sym.dntick}E-`,`${BIGDOT}E-`,`${sym.uptick}E-`,`${sym.doubleuptick}E-`,`${BIGDOT}F-`,`${sym.uptick}F-`,`${sym.doubledntick}F${sym.csharp}`,`${sym.dntick}F${sym.csharp}`,`${BIGDOT}F${sym.csharp}`,`${sym.uptick}F${sym.csharp}`,`${sym.dntick}G-`,`${BIGDOT}G-`,`${sym.uptick}G-`,`${sym.doubledntick}G${sym.csharp}`,`${sym.dntick}G${sym.csharp}`,`${BIGDOT}G${sym.csharp}`,`${sym.uptick}G${sym.csharp}`,`${sym.dntick}A-`,`${BIGDOT}A-`,`${sym.uptick}A-`,`${sym.doubledntick}A${sym.csharp}`,`${sym.dntick}A${sym.csharp}`,`${BIGDOT}A${sym.csharp}`,`${sym.uptick}A${sym.csharp}`,`${sym.dntick}B-`,`${BIGDOT}B-`,`${sym.uptick}B-`,`${sym.doubleuptick}B-`]},
-530:{index:530,name:"53-TET (Kite)", table:[0x0,0x4D,0x9B,0xE8,0x135,0x182,0x1D0,0x21D,0x26A,0x2B8,0x305,0x352,0x39F,0x3ED,0x43A,0x487,0x4D5,0x522,0x56F,0x5BC,0x60A,0x657,0x6A4,0x6F2,0x73F,0x78C,0x7D9,0x827,0x874,0x8C1,0x90E,0x95C,0x9A9,0x9F6,0xA44,0xA91,0xADE,0xB2B,0xB79,0xBC6,0xC13,0xC61,0xCAE,0xCFB,0xD48,0xD96,0xDE3,0xE30,0xE7E,0xECB,0xF18,0xF65,0xFB3],interval:0x1000,
+530:{index:530,name:"53-TET (Kite)",table:[0x0,0x4D,0x9B,0xE8,0x135,0x182,0x1D0,0x21D,0x26A,0x2B8,0x305,0x352,0x39F,0x3ED,0x43A,0x487,0x4D5,0x522,0x56F,0x5BC,0x60A,0x657,0x6A4,0x6F2,0x73F,0x78C,0x7D9,0x827,0x874,0x8C1,0x90E,0x95C,0x9A9,0x9F6,0xA44,0xA91,0xADE,0xB2B,0xB79,0xBC6,0xC13,0xC61,0xCAE,0xCFB,0xD48,0xD96,0xDE3,0xE30,0xE7E,0xECB,0xF18,0xF65,0xFB3],interval:0x1000,t:'m',
 sym:[`${BIGDOT}C-`,`${sym.uptick}C-`,`${sym.doubleuptick}C-`,`${sym.doubledntick}C${sym.csharp}`,`${sym.dntick}C${sym.csharp}`,`${BIGDOT}C${sym.csharp}`,`${sym.uptick}C${sym.csharp}`,`${sym.doubledntick}D-`,`${sym.dntick}D-`,`${BIGDOT}D-`,`${sym.uptick}D-`,`${sym.doubleuptick}D-`,`${sym.doubledntick}D${sym.csharp}`,`${sym.dntick}D${sym.csharp}`,`${BIGDOT}D${sym.csharp}`,`${sym.uptick}D${sym.csharp}`,`${sym.doubledntick}E-`,`${sym.dntick}E-`,`${BIGDOT}E-`,`${sym.uptick}E-`,`${sym.doubleuptick}E-`,`${sym.dntick}F-`,`${BIGDOT}F-`,`${sym.uptick}F-`,`${sym.doubleuptick}F-`,`${sym.doubledntick}F${sym.csharp}`,`${sym.dntick}F${sym.csharp}`,`${BIGDOT}F${sym.csharp}`,`${sym.uptick}F${sym.csharp}`,`${sym.doubledntick}G-`,`${sym.dntick}G-`,`${BIGDOT}G-`,`${sym.uptick}G-`,`${sym.doubleuptick}G-`,`${sym.doubledntick}G${sym.csharp}`,`${sym.dntick}G${sym.csharp}`,`${BIGDOT}G${sym.csharp}`,`${sym.uptick}G${sym.csharp}`,`${sym.doubledntick}A-`,`${sym.dntick}A-`,`${BIGDOT}A-`,`${sym.uptick}A-`,`${sym.doubleuptick}A-`,`${sym.doubledntick}A${sym.csharp}`,`${sym.dntick}A${sym.csharp}`,`${BIGDOT}A${sym.csharp}`,`${sym.uptick}A${sym.csharp}`,`${sym.doubledntick}B-`,`${sym.dntick}B-`,`${BIGDOT}B-`,`${sym.uptick}B-`,`${sym.doubleuptick}B-`,`${sym.dntick}C-`]},
-531:{index:531,name:"53-TET (Pythagorean)", table:[0x0,0x4D,0x9B,0xE8,0x135,0x182,0x1D0,0x21D,0x26A,0x2B8,0x305,0x352,0x39F,0x3ED,0x43A,0x487,0x4D5,0x522,0x56F,0x5BC,0x60A,0x657,0x6A4,0x6F2,0x73F,0x78C,0x7D9,0x827,0x874,0x8C1,0x90E,0x95C,0x9A9,0x9F6,0xA44,0xA91,0xADE,0xB2B,0xB79,0xBC6,0xC13,0xC61,0xCAE,0xCFB,0xD48,0xD96,0xDE3,0xE30,0xE7E,0xECB,0xF18,0xF65,0xFB3],interval:0x1000,
+531:{index:531,name:"53-TET (Pythagorean)",table:[0x0,0x4D,0x9B,0xE8,0x135,0x182,0x1D0,0x21D,0x26A,0x2B8,0x305,0x352,0x39F,0x3ED,0x43A,0x487,0x4D5,0x522,0x56F,0x5BC,0x60A,0x657,0x6A4,0x6F2,0x73F,0x78C,0x7D9,0x827,0x874,0x8C1,0x90E,0x95C,0x9A9,0x9F6,0xA44,0xA91,0xADE,0xB2B,0xB79,0xBC6,0xC13,0xC61,0xCAE,0xCFB,0xD48,0xD96,0xDE3,0xE30,0xE7E,0xECB,0xF18,0xF65,0xFB3],interval:0x1000,t:'m',
 sym:[`C${sym.accnull}`,`B${sym.sharp}`,`A${sym.triplesharp}`,`E${sym.tripleflat}`,`D${sym.flat}`,`C${sym.sharp}`,`B${sym.doublesharp}`,`F${sym.tripleflat}`,`E${sym.doubleflat}`,`D${sym.accnull}`,`C${sym.doublesharp}`,`B${sym.triplesharp}`,`F${sym.doubleflat}`,`E${sym.flat}`,`D${sym.sharp}`,`C${sym.triplesharp}`,`G${sym.tripleflat}`,`F${sym.flat}`,`E${sym.accnull}`,`D${sym.doublesharp}`,`C${sym.quadsharp}`,`G${sym.doubleflat}`,`F${sym.accnull}`,`E${sym.sharp}`,`D${sym.triplesharp}`,`A${sym.tripleflat}`,`G${sym.flat}`,`F${sym.sharp}`,`E${sym.doublesharp}`,`D${sym.quadsharp}`,`A${sym.doubleflat}`,`G${sym.accnull}`,`F${sym.doublesharp}`,`E${sym.triplesharp}`,`B${sym.tripleflat}`,`A${sym.flat}`,`G${sym.sharp}`,`F${sym.triplesharp}`,`C${sym.tripleflat}`,`B${sym.doubleflat}`,`A${sym.accnull}`,`G${sym.doublesharp}`,`F${sym.quadsharp}`,`C${sym.doubleflat}`,`B${sym.flat}`,`A${sym.sharp}`,`G${sym.triplesharp}`,`D${sym.tripleflat}`,`C${sym.flat}`,`B${sym.accnull}`,`A${sym.doublesharp}`,`G${sym.quadsharp}`,`D${sym.doubleflat}`]},
-960:{index:960,name:"96-TET (Kite)", table:[0x0,0x2B,0x55,0x80,0xAB,0xD5,0x100,0x12B,0x155,0x180,0x1AB,0x1D5,0x200,0x22B,0x255,0x280,0x2AB,0x2D5,0x300,0x32B,0x355,0x380,0x3AB,0x3D5,0x400,0x42B,0x455,0x480,0x4AB,0x4D5,0x500,0x52B,0x555,0x580,0x5AB,0x5D5,0x600,0x62B,0x655,0x680,0x6AB,0x6D5,0x700,0x72B,0x755,0x780,0x7AB,0x7D5,0x800,0x82B,0x855,0x880,0x8AB,0x8D5,0x900,0x92B,0x955,0x980,0x9AB,0x9D5,0xA00,0xA2B,0xA55,0xA80,0xAAB,0xAD5,0xB00,0xB2B,0xB55,0xB80,0xBAB,0xBD5,0xC00,0xC2B,0xC55,0xC80,0xCAB,0xCD5,0xD00,0xD2B,0xD55,0xD80,0xDAB,0xDD5,0xE00,0xE2B,0xE55,0xE80,0xEAB,0xED5,0xF00,0xF2B,0xF55,0xF80,0xFAB,0xFD5],interval:0x1000,
+960:{index:960,name:"96-TET (Kite)",table:[0x0,0x2B,0x55,0x80,0xAB,0xD5,0x100,0x12B,0x155,0x180,0x1AB,0x1D5,0x200,0x22B,0x255,0x280,0x2AB,0x2D5,0x300,0x32B,0x355,0x380,0x3AB,0x3D5,0x400,0x42B,0x455,0x480,0x4AB,0x4D5,0x500,0x52B,0x555,0x580,0x5AB,0x5D5,0x600,0x62B,0x655,0x680,0x6AB,0x6D5,0x700,0x72B,0x755,0x780,0x7AB,0x7D5,0x800,0x82B,0x855,0x880,0x8AB,0x8D5,0x900,0x92B,0x955,0x980,0x9AB,0x9D5,0xA00,0xA2B,0xA55,0xA80,0xAAB,0xAD5,0xB00,0xB2B,0xB55,0xB80,0xBAB,0xBD5,0xC00,0xC2B,0xC55,0xC80,0xCAB,0xCD5,0xD00,0xD2B,0xD55,0xD80,0xDAB,0xDD5,0xE00,0xE2B,0xE55,0xE80,0xEAB,0xED5,0xF00,0xF2B,0xF55,0xF80,0xFAB,0xFD5],interval:0x1000,t:'m',
 sym:[`${BIGDOT}C-`,`${sym.uptick}C-`,`${sym.doubleuptick}C-`,`${sym.dntick}C${sym.cdemisharp}`,`${BIGDOT}C${sym.cdemisharp}`,`${sym.uptick}C${sym.cdemisharp}`,`${sym.doubleuptick}C${sym.cdemisharp}`,`${sym.dntick}C${sym.csharp}`,`${BIGDOT}C${sym.csharp}`,`${sym.uptick}C${sym.csharp}`,`${sym.doubleuptick}C${sym.csharp}`,`${sym.dntick}D${sym.cdemiflat}`,`${BIGDOT}D${sym.cdemiflat}`,`${sym.uptick}D${sym.cdemiflat}`,`${sym.doubleuptick}D${sym.cdemiflat}`,`${sym.dntick}D-`,`${BIGDOT}D-`,`${sym.uptick}D-`,`${sym.doubleuptick}D-`,`${sym.dntick}D${sym.cdemisharp}`,`${BIGDOT}D${sym.cdemisharp}`,`${sym.uptick}D${sym.cdemisharp}`,`${sym.doubleuptick}D${sym.cdemisharp}`,`${sym.dntick}D${sym.csharp}`,`${BIGDOT}D${sym.csharp}`,`${sym.uptick}D${sym.csharp}`,`${sym.doubleuptick}D${sym.csharp}`,`${sym.dntick}E${sym.cdemiflat}`,`${BIGDOT}E${sym.cdemiflat}`,`${sym.uptick}E${sym.cdemiflat}`,`${sym.doubleuptick}E${sym.cdemiflat}`,`${sym.dntick}E-`,`${BIGDOT}E-`,`${sym.uptick}E-`,`${sym.doubleuptick}E-`,`${sym.dntick}E${sym.cdemisharp}`,`${BIGDOT}E${sym.cdemisharp}`,`${sym.uptick}E${sym.cdemisharp}`,`${sym.doubleuptick}E${sym.cdemisharp}`,`${sym.dntick}F-`,`${BIGDOT}F-`,`${sym.uptick}F-`,`${sym.doubleuptick}F-`,`${sym.dntick}F${sym.cdemisharp}`,`${BIGDOT}F${sym.cdemisharp}`,`${sym.uptick}F${sym.cdemisharp}`,`${sym.doubleuptick}F${sym.cdemisharp}`,`${sym.dntick}F${sym.csharp}`,`${BIGDOT}F${sym.csharp}`,`${sym.uptick}F${sym.csharp}`,`${sym.doubleuptick}F${sym.csharp}`,`${sym.dntick}G${sym.cdemiflat}`,`${BIGDOT}G${sym.cdemiflat}`,`${sym.uptick}G${sym.cdemiflat}`,`${sym.doubleuptick}G${sym.cdemiflat}`,`${sym.dntick}G-`,`${BIGDOT}G-`,`${sym.uptick}G-`,`${sym.doubleuptick}G-`,`${sym.dntick}G${sym.cdemisharp}`,`${BIGDOT}G${sym.cdemisharp}`,`${sym.uptick}G${sym.cdemisharp}`,`${sym.doubleuptick}G${sym.cdemisharp}`,`${sym.dntick}G${sym.csharp}`,`${BIGDOT}G${sym.csharp}`,`${sym.uptick}G${sym.csharp}`,`${sym.doubleuptick}G${sym.csharp}`,`${sym.dntick}A${sym.cdemiflat}`,`${BIGDOT}A${sym.cdemiflat}`,`${sym.uptick}A${sym.cdemiflat}`,`${sym.doubleuptick}A${sym.cdemiflat}`,`${sym.dntick}A-`,`${BIGDOT}A-`,`${sym.uptick}A-`,`${sym.doubleuptick}A-`,`${sym.dntick}A${sym.cdemisharp}`,`${BIGDOT}A${sym.cdemisharp}`,`${sym.uptick}A${sym.cdemisharp}`,`${sym.doubleuptick}A${sym.cdemisharp}`,`${sym.dntick}A${sym.csharp}`,`${BIGDOT}A${sym.csharp}`,`${sym.uptick}A${sym.csharp}`,`${sym.doubleuptick}A${sym.csharp}`,`${sym.dntick}B${sym.cdemiflat}`,`${BIGDOT}B${sym.cdemiflat}`,`${sym.uptick}B${sym.cdemiflat}`,`${sym.doubleuptick}B${sym.cdemiflat}`,`${sym.dntick}B-`,`${BIGDOT}B-`,`${sym.uptick}B-`,`${sym.doubleuptick}B-`,`${sym.dntick}B${sym.cdemisharp}`,`${BIGDOT}B${sym.cdemisharp}`,`${sym.uptick}B${sym.cdemisharp}`,`${sym.doubleuptick}B${sym.cdemisharp}`,`${sym.dntick}C-`]},
 /* 12-TET variations */
-120:{index:120,name:"12-TET",                         table:[0x0,0x155,0x2AB,0x400,0x555,0x6AB,0x800,0x955,0xAAB,0xC00,0xD55,0xEAB],interval:0x1000,
+120:{index:120,name:"12-TET",table:[0x0,0x155,0x2AB,0x400,0x555,0x6AB,0x800,0x955,0xAAB,0xC00,0xD55,0xEAB],interval:0x1000,t:'d',
 sym:[`C${sym.accnull}`,`C${sym.sharp}`,`D${sym.accnull}`,`D${sym.sharp}`,`E${sym.accnull}`,`F${sym.accnull}`,`F${sym.sharp}`,`G${sym.accnull}`,`G${sym.sharp}`,`A${sym.accnull}`,`A${sym.sharp}`,`B${sym.accnull}`]},
-10121:{index:10121,name:"Pythagorean dim. 5th", table:[0x0,0x134,0x2B8,0x3EC,0x570,0x6A4,0x7D8,0x95C,0xA90,0xC14,0xD48,0xECC],interval:0x1000,
+10121:{index:10121,name:"Pythagorean dim. 5th",table:[0x0,0x134,0x2B8,0x3EC,0x570,0x6A4,0x7D8,0x95C,0xA90,0xC14,0xD48,0xECC],interval:0x1000,t:'d',
 sym:[`C${sym.accnull}`,`C${sym.sharp}`,`D${sym.accnull}`,`D${sym.sharp}`,`E${sym.accnull}`,`F${sym.accnull}`,`F${sym.sharp}`,`G${sym.accnull}`,`G${sym.sharp}`,`A${sym.accnull}`,`A${sym.sharp}`,`B${sym.accnull}`]},
-10122:{index:10122,name:"Pythagorean aug. 4th", table:[0x0,0x134,0x2B8,0x3EC,0x570,0x6A4,0x828,0x95C,0xA90,0xC14,0xD48,0xECC],interval:0x1000,
+10122:{index:10122,name:"Pythagorean aug. 4th",table:[0x0,0x134,0x2B8,0x3EC,0x570,0x6A4,0x828,0x95C,0xA90,0xC14,0xD48,0xECC],interval:0x1000,t:'d',
 sym:[`C${sym.accnull}`,`C${sym.sharp}`,`D${sym.accnull}`,`D${sym.sharp}`,`E${sym.accnull}`,`F${sym.accnull}`,`F${sym.sharp}`,`G${sym.accnull}`,`G${sym.sharp}`,`A${sym.accnull}`,`A${sym.sharp}`,`B${sym.accnull}`]},
-10123:{index:10123,name:"\u00FC\u00FD\u00FE (shi'er lu)",         table:[0x0,0x184,0x2B8,0x43C,0x570,0x6F4,0x828,0x95C,0xAE0,0xC14,0xD98,0xECC],interval:0x1000,
+10123:{index:10123,name:"\u00FC\u00FD\u00FE (shi'er lu)",         table:[0x0,0x184,0x2B8,0x43C,0x570,0x6F4,0x828,0x95C,0xAE0,0xC14,0xD98,0xECC],interval:0x1000,t:'d',
 sym:[` \u00E0\u00E1`,` \u00E2\u00E3`,` \u00E4\u00E5`,` \u00E6\u00E7`,` \u00E8\u00E9`,` \u00EA\u00EB`,` \u00EC\u00ED`,` \u00EE\u00EF`,` \u00F0\u00F1`,` \u00F2\u00F3`,` \u00F4\u00F5`,` \u00F6\u00F7`]},
 /* non-octave */
-35130:{index:35130,name:"Equal-Tempered Bohlen-Pierce", table:[0x0,0x1F3,0x3E7,0x5DA,0x7CE,0x9C1,0xBB4,0xDA8,0xF9B,0x118E,0x1382,0x1575,0x1769],interval:0x195C,
+35130:{index:35130,name:"Equal-Tempered Bohlen-Pierce",table:[0x0,0x1F3,0x3E7,0x5DA,0x7CE,0x9C1,0xBB4,0xDA8,0xF9B,0x118E,0x1382,0x1575,0x1769],interval:0x195C,t:'M',
 sym:[`C${sym.accnull}`,`C${sym.sharp}`,`D${sym.accnull}`,`E${sym.accnull}`,`F${sym.accnull}`,`F${sym.sharp}`,`G${sym.accnull}`,`H${sym.accnull}`,`H${sym.sharp}`,`J${sym.accnull}`,`A${sym.accnull}`,`A${sym.sharp}`,`B${sym.accnull}`]},


@@ -267,7 +269,8 @@ const colEffOp = 220
 const colEffArg = 231
 const colBackPtn = 255

-let PITCH_PRESET_IDX = 120 // TODO read from the Project Data section of the .taud
+const PITCH_PRESET_IDX_DEFAULT = 120
+let PITCH_PRESET_IDX = PITCH_PRESET_IDX_DEFAULT // TODO read from the Project Data section of the .taud
 let beatDivPrimary = 4 // TODO read from the Project Data section of the .taud
 let beatDivSecondary = 16
 let hasUnsavedChanges = false
@@ -463,7 +466,7 @@ function retuneAllPatterns(newIdx, method) {
                for (let row = 0; row < ROWS_PER_PAT; row++) {
                    const off = 8 * row
                    const note = ptn[off] | (ptn[off+1] << 8)
-                    if (note === 0xFFFF || note === 0xFFFE || note === 0x0000) continue
+                    if (note === 0x0000 || note === 0x0001 || note === 0x0002 || (note >= 0x0010 && note <= 0x001F)) continue
                    // Use the full absolute pitch as tonic; the modular ops
                    // in _cadTension / _harmonicCost normalise it.
                    tonic = note
@@ -473,7 +476,7 @@ function retuneAllPatterns(newIdx, method) {
            for (let row = 0; row < ROWS_PER_PAT; row++) {
                const off = 8 * row
                const note = ptn[off] | (ptn[off+1] << 8)
-                if (note === 0xFFFF || note === 0xFFFE || note === 0x0000) continue
+                if (note === 0x0000 || note === 0x0001 || note === 0x0002 || (note >= 0x0010 && note <= 0x001F)) continue
                const origAbs = note
                let newAbs
                if ((method === 'delta' || method === 'cadence' || method === 'harmonic') && prevOrigAbs >= 0) {
@@ -487,7 +490,7 @@ function retuneAllPatterns(newIdx, method) {
                        for (let r = row + 1; r < ROWS_PER_PAT; r++) {
                            const noff = 8 * r
                            const n = ptn[noff] | (ptn[noff+1] << 8)
-                            if (n !== 0x0000) break
+                            if (n !== 0x0001) break
                            duration++
                        }
                        lambda = 1 - Math.exp(-(duration - 1) / 4)
@@ -555,9 +558,10 @@ Number.prototype.decD2 = function() {


 function noteToStr(note) {
-    if (note === 0xFFFF) return sym.middot.repeat(4)
-    if (note === 0xFFFE) return sym.notecut
-    if (note === 0x0000) return sym.keyoff
+    if (note === 0x0000) return sym.middot.repeat(4)
+    if (note === 0x0001) return sym.keyoff
+    if (note === 0x0002) return sym.notecut
+    if (note >= 0x0010 && note <= 0x001F) return ('Int' + (note & 0xF).toString(16).toUpperCase()).padEnd(4)
    const preset = pitchTablePresets[PITCH_PRESET_IDX]
    if (preset.table.length === 0) return note.hex04()
    const [period, offset] = decomposeNote(note, preset.interval)
@@ -653,7 +657,7 @@ const EMPTY_CELL = {
    sPanArg: sym.middot.repeat(2),
    sEffOp:  sym.middot,
    sEffArg: sym.middot.repeat(4),
-    _note: 0xFFFF, _effop: 0, _effarg: 0, _voleff: 0, _paneff: 0
+    _note: 0x0000, _effop: 0, _effarg: 0, _voleff: 0, _paneff: 0
 }

 function drawCellAt(y, x, cell, back) {
@@ -689,7 +693,7 @@ function drawCellAtStyled(y, x, cell, back, style) {
        return
    }
    // Styles 1 and 2: note-or-fx field (5 chars) starts on the border column [+ vol-or-pan (2 chars)]
-    const noteEmpty = (cell._note === 0xFFFF)
+    const noteEmpty = (cell._note === 0x0000)
    const fxEmpty   = (cell._effop === 0 && cell._effarg === 0)
    const volEmpty  = (cell._voleff === 0)
    const panEmpty  = (cell._paneff === 0)
@@ -864,6 +868,7 @@ function loadTaudSongList(filePath) {
            name: '',
            composer: '',
            copyright: '',
+            pitchPresetIdx: null,
        }
    }

@@ -908,6 +913,8 @@ function loadTaudSongList(filePath) {
                        const subStart = q + 5
                        if (subStart + subLen > qEnd) break
                        // payload: notation(u16) + beat_pri(u8) + beat_sec(u8) + name\0 + composer\0 + copyright\0
+                        const notation = (sys.peek(ptr + subStart) & 0xFF) |
+                                         ((sys.peek(ptr + subStart + 1) & 0xFF) << 8)
                        let r = subStart + 4   // skip notation(2) + pri(1) + sec(1)
                        const strs = []
                        while (strs.length < 3 && r < subStart + subLen) {
@@ -920,6 +927,7 @@ function loadTaudSongList(filePath) {
                            strs.push(s)
                        }
                        if (idx < numSongs) {
+                            songs[idx].pitchPresetIdx = notation
                            if (strs[0] !== undefined) songs[idx].name = strs[0]
                            if (strs[1] !== undefined) songs[idx].composer = strs[1]
                            if (strs[2] !== undefined) songs[idx].copyright = strs[2]
@@ -1372,7 +1380,15 @@ function drawControlHint() {
    ]

    const hintElemExternal = [['Tab','Panel'],['sep'],['!','Help']]
-    let hintElems = [hintElemTimeline, hintElemOrders, hintElemPatterns, hintElemExternal, hintElemExternal, hintElemExternal, hintElemExternal]
+    const hintElemProject  = [
+        [`\u008428u\u008429u`,'Nav'],
+        [`ent`,'Edit/Switch'],
+    ['sep'],
+        ['tab','Panel'],
+    ['sep'],
+        ['!','Help'],
+    ]
+    let hintElems = [hintElemTimeline, hintElemOrders, hintElemPatterns, hintElemExternal, hintElemExternal, hintElemProject, hintElemExternal]
    let hintElemPat = [hintElemEditNoteValue, hintElemEditInstValue, hintElemEditVolEff, hintElemEditPanEff, hintElemEditFxSym, hintElemEditFxVal]

    // erase current line
@@ -1530,8 +1546,8 @@ function drawVoiceDetail(isVerticalLayout = false, ptn = null, activeRow = -1, c
        if (cumState !== null && lowerH > 0) {
            const _apo  = Math.abs(cumState.pitchOff)
            const _psgn = cumState.pitchOff > 0 ? '+' : cumState.pitchOff < 0 ? '-' : ' '
-            const _absN = (cumState.lastNote !== 0xFFFF && cumState.pitchOff !== 0)
-                ? noteToStr(Math.max(0, Math.min(0xFFFE, cumState.lastNote + cumState.pitchOff))) + ' '
+            const _absN = (cumState.lastNote !== 0x0000 && cumState.pitchOff !== 0)
+                ? noteToStr(Math.max(0x20, Math.min(0xFFFF, cumState.lastNote + cumState.pitchOff))) + ' '
                : ''
            const _clipNm = ['clamp','fold','wrap','wrap'][cumState.clipMode]
            const _bcStr  = (cumState.bitcrushDepth === 0 && cumState.bitcrushSkip === 0)
@@ -1737,21 +1753,27 @@ if (fullPathObj === undefined) {
    return 1
 }

-const logofile = files.open("A:/tvdos/bin/tauthdr.r8")
+const logofile = files.open("A:"+_TVDOS.variables.DOSDIR+"/bin/tauthdr.r8")
 const logoBytes = logofile.bread(); logofile.close()
 const logoTexture = new gl.Texture(92, 14, logoBytes)
-const buttonfile = files.open("A:/tvdos/bin/tautbtn.r8")
+const buttonfile = files.open("A:"+_TVDOS.variables.DOSDIR+"/bin/tautbtn.r8")
 const buttonBytes = buttonfile.bread(); buttonfile.close()
 const buttonTexture = new gl.Texture(2, 28, buttonBytes)
-//const buttonNullfile = files.open("A:/tvdos/bin/tautbtn0.r8")
+//const buttonNullfile = files.open("A:"+_TVDOS.variables.DOSDIR+"/bin/tautbtn0.r8")
 //const buttonNullBytes = buttonNullfile.bread(); buttonNullfile.close()
 //const buttonNullTexture = new gl.Texture(35, 28, buttonNullBytes)

-font.setLowRom("A:/tvdos/bin/tautfont_low.chr")
-font.setHighRom("A:/tvdos/bin/tautfont_high.chr")
+font.setLowRom("A:"+_TVDOS.variables.DOSDIR+"/bin/tautfont_low.chr")
+font.setHighRom("A:"+_TVDOS.variables.DOSDIR+"/bin/tautfont_high.chr")
 const songsMeta = loadTaudSongList(fullPathObj.full)
 let currentSongIndex = 0
-let projectSongCursor = 0
+// Unified cursor: 0..PROJ_META_ROWS_COUNT-1 = editable meta rows (Flags / GVol / MVol);
+//                 >= PROJ_META_ROWS_COUNT   = song list, songIdx = projectCursor - PROJ_META_ROWS_COUNT
+let projectCursor = 0
+const PROJ_META_ROWS_COUNT = 3
+const PROJ_META_FLAGS = 0
+const PROJ_META_GVOL  = 1
+const PROJ_META_MVOL  = 2
 let song = loadTaud(fullPathObj.full, currentSongIndex)

 const voiceMutes = new Array(NUM_VOICES).fill(false)
@@ -1792,6 +1814,12 @@ function switchSong(newIndex) {
    currentSongIndex = newIndex
    song = loadTaud(fullPathObj.full, newIndex)

+    const newPitchIdx = songsMeta.songs[newIndex].pitchPresetIdx
+    PITCH_PRESET_IDX = (newPitchIdx != null && pitchTablePresets[newPitchIdx])
+        ? newPitchIdx
+        : PITCH_PRESET_IDX_DEFAULT
+    rebuildPitchLut()
+
    taud.uploadTaudFile(fullPathObj.full, newIndex, PLAYHEAD)
    patternsOutOfSync = false
    audio.setMasterVolume(PLAYHEAD, 255)
@@ -2172,42 +2200,31 @@ function visWidth(s) {
    return w
 }

+// Centre-anchored scroll: keep `sel` at the middle row of a `vis`-row viewport,
+// clamped at the list's top and bottom. Returns the new scroll offset.
+function centerScroll(sel, scroll, vis, total) {
+    if (sel < scroll) scroll = sel
+    if (sel < scroll + (vis >>> 1) && scroll > 0) scroll = sel - (vis >>> 1)
+    if (sel >= scroll + ((vis + 1) >>> 1)) scroll = sel - ((vis + 1) >>> 1) + 1
+    if (scroll < 0) scroll = 0
+    if (scroll + vis > total) scroll = Math.max(0, total - vis)
+    return scroll
+}
+
 function clampPatternIdx() {
    if (song.numPats === 0) { patternIdx = 0; patternListScroll = 0; return }
    if (patternIdx < 0) patternIdx = 0
    if (patternIdx >= song.numPats) patternIdx = song.numPats - 1
-    if (patternIdx < patternListScroll) patternListScroll = patternIdx
-    if (patternIdx < patternListScroll + (PTNVIEW_HEIGHT >>> 1) && patternListScroll > 0)
-        patternListScroll = patternIdx - (PTNVIEW_HEIGHT >>> 1)
-    if (patternIdx >= patternListScroll + ((PTNVIEW_HEIGHT + 1) >>> 1))
-        patternListScroll = patternIdx - ((PTNVIEW_HEIGHT + 1) >>> 1) + 1
-    if (patternListScroll < 0) patternListScroll = 0
-    if (patternListScroll + PTNVIEW_HEIGHT > song.numPats)
-        patternListScroll = Math.max(0, song.numPats - PTNVIEW_HEIGHT)
+    patternListScroll = centerScroll(patternIdx, patternListScroll, PTNVIEW_HEIGHT, song.numPats)
 }

 function scrollPatternGridTo(row) {
-    if (row < patternGridScroll) patternGridScroll = row
-    if (row < patternGridScroll + (PTNVIEW_HEIGHT >>> 1) && patternGridScroll > 0)
-        patternGridScroll = row - (PTNVIEW_HEIGHT >>> 1)
-    if (row >= patternGridScroll + ((PTNVIEW_HEIGHT + 1) >>> 1))
-        patternGridScroll = row - ((PTNVIEW_HEIGHT + 1) >>> 1) + 1
-    if (patternGridScroll < 0) patternGridScroll = 0
-    if (patternGridScroll + PTNVIEW_HEIGHT > ROWS_PER_PAT)
-        patternGridScroll = Math.max(0, ROWS_PER_PAT - PTNVIEW_HEIGHT)
+    patternGridScroll = centerScroll(row, patternGridScroll, PTNVIEW_HEIGHT, ROWS_PER_PAT)
 }

 function scrollOrdersTo(ci) {
    const maxCue = song.lastActiveCue < 0 ? 0 : song.lastActiveCue
-    const total  = maxCue + 1
-    if (ci < ordersScroll) ordersScroll = ci
-    if (ci < ordersScroll + (PTNVIEW_HEIGHT >>> 1) && ordersScroll > 0)
-        ordersScroll = ci - (PTNVIEW_HEIGHT >>> 1)
-    if (ci >= ordersScroll + ((PTNVIEW_HEIGHT + 1) >>> 1))
-        ordersScroll = ci - ((PTNVIEW_HEIGHT + 1) >>> 1) + 1
-    if (ordersScroll < 0) ordersScroll = 0
-    if (ordersScroll + PTNVIEW_HEIGHT > total)
-        ordersScroll = Math.max(0, total - PTNVIEW_HEIGHT)
+    ordersScroll = centerScroll(ci, ordersScroll, PTNVIEW_HEIGHT, maxCue + 1)
 }

 function clampPatternGrid() {
@@ -2240,7 +2257,7 @@ function simulateRowState(ptnDat, uptoRow) {
         0x0000,  0x0023,  0x0046,  0x0074,  0x0098,  0x00C8,  0x00F9,  0x0110
    ]

-    let lastNote = 0xFFFF, lastInst = 0
+    let lastNote = 0x0000, lastInst = 0
    let volAbs   = 0x3F                  // 6-bit per-note volume (engine: noteVolume axis;
                                         // M / N's per-channel axis is not modelled here)
    let panAbs   = 0x80                  // 8-bit channel pan (engine width); centre = $80
@@ -2293,8 +2310,8 @@ function simulateRowState(ptnDat, uptoRow) {
        // not tracked by this simulator. The simulator approximates the seed
        // as 0x3F (legacy fallback) — see the longer note below.
        let reloadDefaultVol = false
-        if (note !== 0xFFFF && note !== 0xFFFE) {
-            if (note === 0x0000) {
+        if (note !== 0x0000 && note !== 0x0002 && !(note >= 0x0010 && note <= 0x001F)) {
+            if (note === 0x0001) {
                // key-off; sample stays referenced
            } else if (isGRow) {
                portaTarget = note
@@ -2417,7 +2434,7 @@ function simulateRowState(ptnDat, uptoRow) {
            }
            else if (effop === OP_G) {
                if (effarg !== 0) memG = effarg
-                if (portaTarget !== -1 && memG !== 0 && lastNote !== 0xFFFF) {
+                if (portaTarget !== -1 && memG !== 0 && lastNote !== 0x0000) {
                    const curPitch = lastNote + pitchOff
                    const diff     = portaTarget - curPitch
                    if (diff !== 0) {
@@ -2703,6 +2720,12 @@ function makeExternalPanelDraw(progName) {
    }
 }

+// Row offsets (within the meta block at the top of the Project panel) of the editable rows.
+const PROJ_META_ROW_FLAGS = 5
+const PROJ_META_ROW_GVOL  = 6
+const PROJ_META_ROW_MVOL  = 7
+const PROJ_META_VALUE_X   = 12
+
 function drawProjectContents(wo) {
    fillLine(PTNVIEW_OFFSET_Y - 1, colVoiceHdr, 255)
    for (let y = PTNVIEW_OFFSET_Y; y < SCRH; y++) fillLine(y, colBackPtn, 255)
@@ -2720,15 +2743,29 @@ function drawProjectContents(wo) {
        Cues: `${song.lastActiveCue}/1024 ($${song.lastActiveCue.hex03()})`,
        Notation: pitchTablePresets[PITCH_PRESET_IDX].name,
        Flags: `${flagStrSelected.join(', ')} ($${mixerflag.hex02()})`,
-        GlobalVol: initialGlobalVolume,
-        MixingVol: initialMixingVolume
+        GlobalVol: `$${initialGlobalVolume.hex02()}`,
+        MixingVol: `$${initialMixingVolume.hex02()}`
+    }
+
+    const editableMap = {
+        [PROJ_META_ROW_FLAGS]: PROJ_META_FLAGS,
+        [PROJ_META_ROW_GVOL] : PROJ_META_GVOL,
+        [PROJ_META_ROW_MVOL] : PROJ_META_MVOL,
    }

    Object.entries(projMeta).forEach(([key, value], index) => {
        con.move(PTNVIEW_OFFSET_Y + index, 2)
        con.color_pair(colStatus, 255); print(key)
-        con.move(PTNVIEW_OFFSET_Y + index, 12)
-        con.color_pair(colVoiceHdr, colBLACK); print(value)
+        con.move(PTNVIEW_OFFSET_Y + index, PROJ_META_VALUE_X)
+        const isEditable = (index in editableMap)
+        const isSelected = isEditable && projectCursor === editableMap[index]
+        if (isSelected) {
+            con.color_pair(colWHITE, colHighlight); print(' ' + value + ' ')
+        } else if (isEditable) {
+            con.color_pair(colVoiceHdr, colBackPtn); print(' ' + value + ' ')
+        } else {
+            con.color_pair(colVoiceHdr, colBLACK); print(value)
+        }
    })

    drawProjectSongList()
@@ -2745,14 +2782,18 @@ function projectSongListRowsVisible() {

 let projectSongScroll = 0

-function clampProjectSongCursor() {
+function clampProjectCursor() {
    const n = songsMeta.numSongs
-    if (projectSongCursor < 0) projectSongCursor = 0
-    if (projectSongCursor > n - 1) projectSongCursor = n - 1
+    const maxCur = PROJ_META_ROWS_COUNT + Math.max(0, n - 1)
+    if (projectCursor < 0) projectCursor = 0
+    if (projectCursor > maxCur) projectCursor = maxCur
    const rowsVis = projectSongListRowsVisible()
-    if (projectSongCursor < projectSongScroll) projectSongScroll = projectSongCursor
-    else if (projectSongCursor >= projectSongScroll + rowsVis)
-        projectSongScroll = projectSongCursor - rowsVis + 1
+    if (projectCursor >= PROJ_META_ROWS_COUNT) {
+        const songIdx = projectCursor - PROJ_META_ROWS_COUNT
+        if (songIdx < projectSongScroll) projectSongScroll = songIdx
+        else if (songIdx >= projectSongScroll + rowsVis)
+            projectSongScroll = songIdx - rowsVis + 1
+    }
    if (projectSongScroll < 0) projectSongScroll = 0
 }

@@ -2775,7 +2816,8 @@ function drawProjectSongList() {
        }
        const s        = songsMeta.songs[idx]
        const isActive = (idx === currentSongIndex)
-        const isSel    = (idx === projectSongCursor)
+        const isSel    = (projectCursor >= PROJ_META_ROWS_COUNT) &&
+                         (idx === projectCursor - PROJ_META_ROWS_COUNT)
        const back     = isSel ? colHighlight : colBackPtn

        const marker  = isActive ? sym.playhead : ' '
@@ -2818,28 +2860,50 @@ function projectInput(wo, event) {
        return
    }

-    if (!keyJustHit) return
+    // if (!keyJustHit) return

    if (keysym === '<UP>') {
-        projectSongCursor -= moveDelta; clampProjectSongCursor(); redrawPanel(); return
+        projectCursor -= moveDelta; clampProjectCursor(); redrawPanel(); return
    }
    if (keysym === '<DOWN>') {
-        projectSongCursor += moveDelta; clampProjectSongCursor(); redrawPanel(); return
+        projectCursor += moveDelta; clampProjectCursor(); redrawPanel(); return
    }
    if (keysym === '<PAGE_UP>') {
-        projectSongCursor -= projectSongListRowsVisible(); clampProjectSongCursor(); redrawPanel(); return
+        projectCursor -= projectSongListRowsVisible(); clampProjectCursor(); redrawPanel(); return
    }
    if (keysym === '<PAGE_DOWN>') {
-        projectSongCursor += projectSongListRowsVisible(); clampProjectSongCursor(); redrawPanel(); return
+        projectCursor += projectSongListRowsVisible(); clampProjectCursor(); redrawPanel(); return
    }
    if (keysym === '<HOME>') {
-        projectSongCursor = 0; clampProjectSongCursor(); redrawPanel(); return
+        projectCursor = 0; clampProjectCursor(); redrawPanel(); return
    }
    if (keysym === '<END>') {
-        projectSongCursor = songsMeta.numSongs - 1; clampProjectSongCursor(); redrawPanel(); return
+        projectCursor = PROJ_META_ROWS_COUNT + Math.max(0, songsMeta.numSongs - 1)
+        clampProjectCursor(); redrawPanel(); return
    }
    if (keysym === '\n') {
-        if (projectSongCursor !== currentSongIndex) switchSong(projectSongCursor)
+        if (projectCursor === PROJ_META_FLAGS) {
+            openFlagsPopup()
+        } else if (projectCursor === PROJ_META_GVOL) {
+            const v = openInlineHexEdit(PTNVIEW_OFFSET_Y + PROJ_META_ROW_GVOL, PROJ_META_VALUE_X, 2, initialGlobalVolume)
+            if (v !== null) {
+                initialGlobalVolume = v & 0xFF
+                audio.setSongGlobalVolume(PLAYHEAD, initialGlobalVolume)
+                hasUnsavedChanges = true
+            }
+            redrawPanel()
+        } else if (projectCursor === PROJ_META_MVOL) {
+            const v = openInlineHexEdit(PTNVIEW_OFFSET_Y + PROJ_META_ROW_MVOL, PROJ_META_VALUE_X, 2, initialMixingVolume)
+            if (v !== null) {
+                initialMixingVolume = v & 0xFF
+                audio.setSongMixingVolume(PLAYHEAD, initialMixingVolume)
+                hasUnsavedChanges = true
+            }
+            redrawPanel()
+        } else {
+            const songIdx = projectCursor - PROJ_META_ROWS_COUNT
+            if (songIdx !== currentSongIndex) switchSong(songIdx)
+        }
        return
    }
    if (keysym === ' ') {
@@ -3100,13 +3164,7 @@ function updatePlayback() {
 function clampCursor() {
    if (cursorRow < 0) cursorRow = 0
    if (cursorRow >= ROWS_PER_PAT) cursorRow = ROWS_PER_PAT - 1
-    if (cursorRow < scrollRow) scrollRow = cursorRow
-    // these two IF statements will keep the cursor at the centre until viewpoint scroll edge has reached
-    if (cursorRow < scrollRow + (PTNVIEW_HEIGHT>>>1) && scrollRow > 0) scrollRow = cursorRow - (PTNVIEW_HEIGHT>>>1)
-    if (cursorRow >= scrollRow + ((PTNVIEW_HEIGHT+1)>>>1)) scrollRow = cursorRow - ((PTNVIEW_HEIGHT+1)>>>1) + 1
-    if (scrollRow < 0) scrollRow = 0
-    if (scrollRow + PTNVIEW_HEIGHT > ROWS_PER_PAT)
-        scrollRow = Math.max(0, ROWS_PER_PAT - PTNVIEW_HEIGHT)
+    scrollRow = centerScroll(cursorRow, scrollRow, PTNVIEW_HEIGHT, ROWS_PER_PAT)
 }

 function clampVoice() {
@@ -3387,6 +3445,10 @@ function openRetunePopup() {
    const entries = Object.values(pitchTablePresets).sort((a, b) => a.index - b.index)
    const n = entries.length

+    // Foreground colour by tuning type (preset.t):
+    //   'd' = 12-tone family, 'M' = Macrotonal, 'm' = microtonal, '' = Raw.
+    const tuningTypeColour = { d: 230, M: colPan, m: colInst, '': colStatus }
+
    const methodLabels = {
        pitch:    'Nearest-note',
        delta:    'Nearest-delta',
@@ -3411,7 +3473,7 @@ function openRetunePopup() {

    let sel = entries.findIndex(p => p.index === PITCH_PRESET_IDX)
    if (sel < 0) sel = 0
-    let scroll = (sel >= listH) ? Math.min(Math.max(0, n - listH), sel - (listH >>> 1)) : 0
+    let scroll = centerScroll(sel, 0, listH, n)

    const repaint = () => {
        con.color_pair(230, colPopupBack)
@@ -3440,7 +3502,7 @@ function openRetunePopup() {
            const isSel = (idx === sel)
            const isCur = (e.index === PITCH_PRESET_IDX)
            const back  = isSel ? colHighlight : colPopupBack
-            const fore  = isSel ? colWHITE : (isCur ? colWHITE : 230)
+            const fore  = (e.t in tuningTypeColour) ? tuningTypeColour[e.t] : 230
            const marker = isCur ? sym.playhead : ' '
            let label = `${marker} ${e.index.toString().padStart(5, ' ')}  ${e.name}`
            if (label.length > listW) label = label.substring(0, listW)
@@ -3500,30 +3562,17 @@ function openRetunePopup() {
                repaint()
            }
            else if (ks === '<UP>') {
-                if (sel > 0) {
-                    sel--
-                    if (sel < scroll) scroll = sel
-                    repaint()
-                }
+                if (sel > 0) { sel--; scroll = centerScroll(sel, scroll, listH, n); repaint() }
            } else if (ks === '<DOWN>') {
-                if (sel < n - 1) {
-                    sel++
-                    if (sel >= scroll + listH) scroll = sel - listH + 1
-                    repaint()
-                }
+                if (sel < n - 1) { sel++; scroll = centerScroll(sel, scroll, listH, n); repaint() }
            } else if (ks === '<HOME>') {
-                sel = 0; scroll = 0; repaint()
+                sel = 0; scroll = centerScroll(sel, scroll, listH, n); repaint()
            } else if (ks === '<END>') {
-                sel = n - 1; scroll = Math.max(0, n - listH); repaint()
+                sel = n - 1; scroll = centerScroll(sel, scroll, listH, n); repaint()
            } else if (ks === '<PAGE_UP>') {
-                sel = Math.max(0, sel - listH)
-                scroll = Math.max(0, scroll - listH)
-                if (sel < scroll) scroll = sel
-                repaint()
+                sel = Math.max(0, sel - listH); scroll = centerScroll(sel, scroll, listH, n); repaint()
            } else if (ks === '<PAGE_DOWN>') {
-                sel = Math.min(n - 1, sel + listH)
-                if (sel >= scroll + listH) scroll = Math.min(Math.max(0, n - listH), sel - listH + 1)
-                repaint()
+                sel = Math.min(n - 1, sel + listH); scroll = centerScroll(sel, scroll, listH, n); repaint()
            }
        })
    }
@@ -3538,6 +3587,169 @@ function openRetunePopup() {
    drawAll()
 }

+/////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// MIXER FLAGS POPUP
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+function openFlagsPopup() {
+    const toneNames = ['Linear pitch', 'Amiga pitch', 'Linear freq']
+    const intpNames = ['Default', 'None', 'A500', 'A1200', 'SNES', 'DPCM']
+
+    let toneMode = initialTrackerMixerflags & 3
+    let intpMode = (initialTrackerMixerflags >>> 2) & 7
+    if (toneMode >= toneNames.length) toneMode = 0
+    if (intpMode >= intpNames.length) intpMode = 0
+
+    // Build list rows: headers + selectable radio options.
+    // items[].kind: undefined = header, 'tone' | 'intp' = selectable.
+    const items = []
+    items.push({ label: 'Tone Mode:' })
+    toneNames.forEach((n, i) => items.push({ kind: 'tone', idx: i, label: n }))
+    items.push({ label: '' })
+    items.push({ label: 'Interpolation:' })
+    intpNames.forEach((n, i) => items.push({ kind: 'intp', idx: i, label: n }))
+
+    const selectables = []
+    items.forEach((it, i) => { if (it.kind) selectables.push(i) })
+    let sel = 0
+
+    const pw = 28
+    const ph = items.length + 4
+    const px = ((SCRW - pw) / 2 | 0) + 1
+    const py = ((SCRH - ph) / 2 | 0)
+
+    const popup = new win.WindowObject(px, py, pw, ph, ()=>{}, ()=>{}, 'Mixer Flags', popupDrawFrame)
+    popup.isHighlighted = true
+    popup.titleBack = colPopupBack
+
+    const repaint = () => {
+        con.color_pair(230, colPopupBack)
+        popup.drawFrame()
+
+        for (let i = 0; i < items.length; i++) {
+            const it = items[i]
+            con.move(py + 1 + i, px + 2)
+            if (!it.kind) {
+                con.color_pair(colStatus, colPopupBack)
+                print(it.label.padEnd(pw - 4))
+            } else {
+                const isSel    = (selectables[sel] === i)
+                const isChecked = (it.kind === 'tone')
+                    ? (toneMode === it.idx)
+                    : (intpMode === it.idx)
+                const back = isSel ? colHighlight : colPopupBack
+                const fore = isChecked ? colVoiceHdr : colWHITE
+                con.color_pair(fore, back)
+                const line = ' ' + (isChecked ? sym.ticked : sym.unticked) + ' ' + it.label
+                print(line.padEnd(pw - 4))
+            }
+        }
+
+        con.move(py + ph - 2, px + 2)
+        con.color_pair(colVoiceHdr, colPopupBack); print(`\u008418u `)
+        con.color_pair(colStatus,   colPopupBack); print('Sel ')
+        con.color_pair(colVoiceHdr, colPopupBack); print('sp ')
+        con.color_pair(colStatus,   colPopupBack); print('Tick ')
+        con.color_pair(colVoiceHdr, colPopupBack); print('ent ')
+        con.color_pair(colStatus,   colPopupBack); print('OK ')
+        con.color_pair(colVoiceHdr, colPopupBack); print('Q ')
+        con.color_pair(colStatus,   colPopupBack); print('X')
+
+        con.color_pair(colStatus, 255)
+    }
+
+    repaint()
+
+    let done = false
+    let confirmed = false
+    let eventJustReceived = true
+    while (!done) {
+        input.withEvent(ev => {
+            if (ev[0] !== 'key_down') return
+            if (1 !== ev[2]) return
+            const ks = ev[1]
+            if (eventJustReceived) { eventJustReceived = false; return }
+
+            if (ks === '<ESC>' || ks === 'q' || ks === 'Q') { done = true; return }
+            if (ks === '\n') { confirmed = true; done = true; return }
+            if (ks === '<UP>'   && sel > 0)                    { sel--; repaint(); return }
+            if (ks === '<DOWN>' && sel < selectables.length-1) { sel++; repaint(); return }
+            if (ks === ' ') {
+                const it = items[selectables[sel]]
+                if (it.kind === 'tone') toneMode = it.idx
+                else if (it.kind === 'intp') intpMode = it.idx
+                repaint()
+                return
+            }
+        })
+    }
+
+    if (confirmed) {
+        const newFlags = (initialTrackerMixerflags & ~0x1F) |
+                         (toneMode & 3) | ((intpMode & 7) << 2)
+        if (newFlags !== initialTrackerMixerflags) {
+            initialTrackerMixerflags = newFlags
+            audio.setTrackerMixerFlags(PLAYHEAD, newFlags)
+            hasUnsavedChanges = true
+        }
+    }
+
+    drawAll()
+}
+
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////
+// INLINE HEX EDITOR
+/////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+// Overlay an editable hex field at (y, x) with `digits` digits, pre-filled from `initialValue`.
+// Returns the new integer on commit, or null on cancel. Reusable for pattern-grid edits.
+function openInlineHexEdit(y, x, digits, initialValue) {
+    let buf = (initialValue >>> 0).toString(16).toUpperCase()
+    if (buf.length > digits) buf = buf.substring(buf.length - digits)
+    buf = buf.padStart(digits, '0')
+
+    let cur = 0
+    let cancelled = false
+    let done = false
+
+    const repaint = () => {
+        con.move(y, x)
+        con.color_pair(colWHITE, colHighlight)
+        print(' $' + buf + ' ')
+        con.move(y, x + 2 + cur)
+        con.color_pair(colBLACK, colWHITE)
+        print(buf[cur])
+        con.color_pair(colStatus, 255)
+    }
+
+    repaint()
+    let eventJustReceived = true
+    while (!done) {
+        input.withEvent(ev => {
+            if (ev[0] !== 'key_down') return
+            if (1 !== ev[2]) return
+            const ks = ev[1]
+            if (eventJustReceived) { eventJustReceived = false; return }
+
+            if (ks === '<ESC>') { cancelled = true; done = true; return }
+            if (ks === '\n')    { done = true; return }
+            if (ks === '<LEFT>'  && cur > 0)          { cur--; repaint(); return }
+            if (ks === '<RIGHT>' && cur < digits - 1) { cur++; repaint(); return }
+            if (ks === '<HOME>')                      { cur = 0; repaint(); return }
+            if (ks === '<END>')                       { cur = digits - 1; repaint(); return }
+            if (ks.length === 1 && '0123456789abcdefABCDEF'.includes(ks)) {
+                buf = buf.substring(0, cur) + ks.toUpperCase() + buf.substring(cur + 1)
+                if (cur < digits - 1) cur++
+                else done = true
+                repaint()
+                return
+            }
+        })
+    }
+
+    return cancelled ? null : parseInt(buf, 16)
+}
+
 clampCursor(); clampVoice(); clampCue(); clampOrdersHoriz(); clampPatternIdx(); clampPatternGrid()
 drawAll()

--- a/assets/disk0/tvdos/bin/taut_helpmsg.js
+++ b/assets/disk0/tvdos/bin/taut_helpmsg.js
@@ -116,7 +116,8 @@ Timeline has two distinct modes: view and edit mode. Two modes are toggled using

 <b>&nbsp;GLOBAL EDIT</b>
 <b>\u00B7${'\u00B8'.repeat(11)}\u00B9</b>
-&bul;<b>Q</b> : <O>retune current song into different tuning</O>
+&bul;<b>Q</b> : <O>retune current song into different tuning and strategy</O>
+&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<O>In general, nearest-note works best for macrotonals, nearest-harmonic and nearest-delta works best for highly microtonals (31+); 17- and 19-TET takes nearest-harmonic pretty well, while 22-TET seem to only benefit from the nearest-note</O>
 `

 ////////////////////////////////////////////////////////////////////////////////////////////////////
--- a/assets/disk0/tvdos/bin/zfm.js
+++ b/assets/disk0/tvdos/bin/zfm.js
@@ -66,9 +66,58 @@ const EXEC_FUNS = {
    "txt": (f) => _G.shell.execute(`less "${f}"`),
    "md": (f) => _G.shell.execute(`less "${f}"`),
    "log": (f) => _G.shell.execute(`less "${f}"`),
-    "taud": (f) => _G.shell.execute(`taut "${f}"`),
+    "taud": (f) => _G.shell.execute(`microtone "${f}"`),
 }

+function makeExecFun(template) {
+    return (f) => _G.shell.execute(template.replaceAll("{0}", `"${f}"`))
+}
+
+function loadZfmrc() {
+    try {
+        let zfmrcPath = `A:${_TVDOS.variables.USERCONFIGPATH}\\zfmrc`
+        let zfmrcFile = files.open(zfmrcPath)
+        if (!zfmrcFile.exists) return
+
+        let content = zfmrcFile.sread()
+        let lines = content.split(/\r?\n/)
+        let currentSection = null
+
+        for (let i = 0; i < lines.length; i++) {
+            let line = lines[i].trim()
+            if (line.length === 0 || line.startsWith("#") || line.startsWith(";")) continue
+
+            if (line.startsWith("[") && line.endsWith("]")) {
+                currentSection = line.substring(1, line.length - 1).toUpperCase()
+                continue
+            }
+
+            if (currentSection === "EXEC_FUNS") {
+                let commaIdx = line.indexOf(",")
+                if (commaIdx < 0) continue
+                let ext = line.substring(0, commaIdx).trim().toLowerCase()
+                let template = line.substring(commaIdx + 1).trim()
+                if (ext.length === 0 || template.length === 0) continue
+                EXEC_FUNS[ext] = makeExecFun(template)
+            }
+            else if (currentSection === "COL_HL_EXT") {
+                let commaIdx = line.indexOf(",")
+                if (commaIdx < 0) continue
+                let ext = line.substring(0, commaIdx).trim().toLowerCase()
+                let colStr = line.substring(commaIdx + 1).trim()
+                if (ext.length === 0 || colStr.length === 0) continue
+                let col = parseInt(colStr, 10)
+                if (isNaN(col)) continue
+                COL_HL_EXT[ext] = col
+            }
+        }
+    } catch (e) {
+        serial.println("zfm: failed to load zfmrc: " + e.message)
+    }
+}
+
+loadZfmrc()
+
 let windowMode = 0 // 0 == left, 1 == right
 let windowFocus = [0] // is a stack; 0: files window, 1: palette window, 2: popup window

@@ -82,6 +131,7 @@ let cursor = [0, 0] // absolute position!

 function bytesToReadable(i) {
    return ''+ (
+       (i > 999999999999) ? (((i / 10000000000)|0)/100 + "T") :
       (i > 999999999) ? (((i / 10000000)|0)/100 + "G") :
       (i > 999999) ? (((i / 10000)|0)/100 + "M") :
       (i > 9999) ? (((i / 100)|0)/10 + "K") :
@@ -677,11 +727,11 @@ while (!exit) {
        let keysym = event[1]
        let keyJustHit = (1 == event[2])

-        if (keyJustHit && event[3] != keys.ENTER) { // release the latch right away if the key is not Return
+        if (keyJustHit && event[3] != keys.ENTER && keysym != "q") { // release the latch right away if the key is neither Return nor 'q'
            firstRunLatch = false
        }

-        if (keyJustHit && firstRunLatch) { // filter out the initial ENTER key as they would cause unwanted behaviours
+        if (keyJustHit && firstRunLatch) { // filter out the initial ENTER/'q' key as they would cause unwanted behaviours
            firstRunLatch = false
        }
        else {
--- a/assets/disk0/tvdos/include/fs.mjs
+++ b/assets/disk0/tvdos/include/fs.mjs
--- a/assets/disk0/tvdos/include/tbas.mjs
+++ b/assets/disk0/tvdos/include/tbas.mjs
@@ -0,0 +1,621 @@
+// Terran BASIC runtime helper for compiled programs
+// Compiled-by: assets/disk0/tbas/compile.js
+// Loaded at runtime by `let bS = require("tbas")`
+//
+// Contract with compiler:
+//   - The compiler has lowered every BASIC expression to a JS expression
+//     that produces the *raw* JS value (number, string, array, ForGen,
+//     function, BasicMemoMonad, …). Builtins take such raw values, NOT
+//     SyntaxTreeReturnObj wrappers.
+//   - Variable reads: bS.__state.vars.X    (key always uppercased)
+//   - Variable writes: bS.__state.vars.X = v
+//   - Control flow (GOTO/GOSUB/RETURN/FOR/NEXT/IF/ON/END/READ/RESTORE/LABEL/DATA)
+//     is *not* exposed here — the compiler emits inline JS that updates the
+//     `pc` and `gosubStack` directly.
+//
+// Naming: BASIC builtins exposed under their UPPERCASE name (bS.PRINT,
+// bS.PLOT, bS.SIN). Compiler-only helpers prefixed with __.
+
+// ---------------------------------------------------------------------------
+// Types & helpers
+// ---------------------------------------------------------------------------
+
+function isNumable(s) {
+    if (Array.isArray(s)) return false
+    if (s === undefined) return false
+    if (typeof s.trim == "function" && s.trim().length == 0) return false
+    return !isNaN(s)
+}
+const tonum = (t) => t * 1.0
+
+function ForGen(s, e, t) {
+    this.start = s
+    this.end = e
+    this.step = t || 1
+    this.current = this.start
+    this.stepsgn = (this.step > 0) ? 1 : -1
+}
+const isGenerator = (o) =>
+    o !== undefined && o !== null &&
+    o.start !== undefined && o.end !== undefined &&
+    o.step !== undefined && o.stepsgn !== undefined
+const genToArray = (gen) => {
+    let a = []
+    let cur = gen.start
+    while (cur * gen.stepsgn + gen.step * gen.stepsgn <= (gen.end + gen.step) * gen.stepsgn) {
+        a.push(cur)
+        cur += gen.step
+    }
+    return a
+}
+const genHasNext = (o) => o.current * o.stepsgn + o.step * o.stepsgn <= (o.end + o.step) * o.stepsgn
+const genGetNext = (gen, mutated) => {
+    if (mutated !== undefined) gen.current = tonum(mutated)
+    gen.current += gen.step
+    return genHasNext(gen) ? gen.current : undefined
+}
+
+function BasicMemoMonad(m) { this.mType = "value"; this.mVal = m }
+function BasicListMonad(m) { this.mType = "list";  this.mVal = [m] }
+function BasicFunSeq(f)    { this.mType = "funseq"; this.mVal = f }
+const isMonad = (o) => o !== undefined && o !== null && o.mType !== undefined
+
+function arrayToString(a) {
+    let acc = ""
+    for (let k = 0; k < a.length; k++) {
+        if (k > 0) acc += ","
+        acc += (Array.isArray(a[k])) ? arrayToString(a[k]) : a[k]
+    }
+    return "{" + acc + "}"
+}
+
+// ---------------------------------------------------------------------------
+// State container
+// ---------------------------------------------------------------------------
+
+const _initialConsts = () => ({
+    NIL: [],
+    PI: Math.PI,
+    TAU: Math.PI * 2,
+    EULER: Math.E,
+    UNDEFINED: undefined,
+    TRUE: true,
+    FALSE: false,
+    // ID is identity-function: emitted as JS arrow when needed
+    ID: (x) => x,
+})
+
+const state = {
+    vars: _initialConsts(),
+    indexBase: 0,
+    dataConsts: [],
+    dataCursor: 0,
+    gotoLabels: {},   // labelName -> [lnum, stmt]
+    lineList: [],     // sorted ascending list of existing source lines (for GOTO snap)
+    rnd: Math.random(),
+    forVar: {},       // varname -> generator|array (the iterable we still owe to FOR/FOREACH)
+    forLnums: {},     // varname -> [lnum, stmt of the FOR/FOREACH header]
+    forStack: [],
+    trace: false,
+    debug: false,
+}
+
+function __reset() {
+    state.vars = _initialConsts()
+    state.indexBase = 0
+    state.dataConsts = []
+    state.dataCursor = 0
+    state.gotoLabels = {}
+    state.lineList = []
+    state.rnd = Math.random()
+    state.forVar = {}
+    state.forLnums = {}
+    state.forStack = []
+}
+
+function __data(values)  { state.dataConsts = values.slice() }
+function __labels(map)   { state.gotoLabels = Object.assign({}, map) }
+function __setLines(arr) { state.lineList = arr.slice() }
+
+// ---------------------------------------------------------------------------
+// Compiler-emitted operator helpers (need behaviour not directly expressible
+// in raw JS without losing semantics)
+// ---------------------------------------------------------------------------
+
+function __add(lh, rh) {
+    return (!isNaN(lh) && !isNaN(rh)) ? (tonum(lh) + tonum(rh)) : (lh + rh)
+}
+function __div(lh, rh)    { if (rh == 0) throw Error("Division by zero"); return lh / rh }
+function __intdiv(lh, rh) { if (rh == 0) throw Error("Division by zero"); return (lh / rh) | 0 }
+function __mod(lh, rh)    { if (rh == 0) throw Error("Division by zero"); return lh % rh }
+function __pow(lh, rh) {
+    let r = Math.pow(lh, rh)
+    if (isNaN(r)) throw Error("Illegal function call")
+    if (!isFinite(r)) throw Error("Division by zero")
+    return r
+}
+
+function __test(v) { return !!v }   // matches builtin TEST: string "false" is truthy
+
+function __dim(dims) {
+    let revdims = dims.slice().reverse()
+    let inner = new Array(revdims[0]).fill(0)
+    for (let k = 1; k < revdims.length; k++) {
+        const sz = revdims[k]
+        const prev = inner
+        inner = new Array(sz).fill(0).map(_ => JSON.parse(JSON.stringify(prev)))
+    }
+    return inner
+}
+
+function __subscriptError(idx, dim) {
+    return Error("Subscript out of range (index " + idx + ", dim " + dim + ")")
+}
+function __arrGet(arr, idx) {
+    let v = arr
+    for (let i = 0; i < idx.length; i++) {
+        if (v === undefined || v === null) throw __subscriptError(idx[i], i)
+        v = v[idx[i] - state.indexBase]
+    }
+    return v
+}
+function __arrSet(arr, idx, value) {
+    let v = arr
+    for (let i = 0; i < idx.length - 1; i++) {
+        if (v === undefined || v === null) throw __subscriptError(idx[i], i)
+        v = v[idx[i] - state.indexBase]
+    }
+    if (v === undefined || v === null) throw __subscriptError(idx[idx.length - 1], idx.length - 1)
+    v[idx[idx.length - 1] - state.indexBase] = value
+}
+
+// FOR / FOREACH setup. Lowered as:
+//   __forSetup(varname, iterable, bodyLnum, bodyStmt)
+// where iterable is a ForGen (FOR…TO…STEP) OR an Array (FOREACH IN…), and
+// (bodyLnum, bodyStmt) is the PC of the statement immediately following the
+// FOR header — i.e. where NEXT should jump back to. The compiler supplies
+// this directly so the state machine doesn't rely on fall-through.
+function __forSetup(varname, iterable, bodyLnum, bodyStmt) {
+    const v = varname.toUpperCase()
+    if (isGenerator(iterable)) {
+        state.vars[v] = iterable.start
+        state.forVar[v] = iterable
+    } else if (Array.isArray(iterable)) {
+        state.vars[v] = iterable[0]
+        state.forVar[v] = iterable.slice(1)  // remainder
+    } else {
+        throw Error("FOR: not a generator or array")
+    }
+    state.forLnums[v] = [bodyLnum, bodyStmt]
+    state.forStack.push(v)
+}
+
+// NEXT [varname]. Without varname, pops the most recent.
+// Returns [lnum, stmt] to jump back to (just-after the FOR header) if more
+// iterations remain, or undefined if the loop is exhausted (caller falls
+// through).
+function __forNext(varname) {
+    let v
+    if (varname === undefined || varname === null) {
+        v = state.forStack.pop()
+    } else {
+        v = varname.toUpperCase()
+        // remove this varname from the stack
+        const idx = state.forStack.lastIndexOf(v)
+        if (idx >= 0) state.forStack.splice(idx, 1)
+    }
+    if (v === undefined) throw Error("NEXT without FOR")
+
+    const it = state.forVar[v]
+    let nextVal
+    if (isGenerator(it)) {
+        nextVal = genGetNext(it, state.vars[v])
+    } else {
+        nextVal = it.shift()
+    }
+
+    if (nextVal !== undefined) {
+        state.vars[v] = nextVal
+        state.forStack.push(v)
+        return state.forLnums[v]   // already the PC of the loop body
+    } else {
+        if (isGenerator(it)) state.vars[v] = it.current
+        return undefined
+    }
+}
+
+function __readData() {
+    const r = state.dataConsts[state.dataCursor++]
+    if (r === undefined) throw Error("Out of DATA")
+    return r
+}
+
+// Resolve a GOTO/GOSUB target — accepts numeric line, label string, or
+// already-evaluated expression. For numeric targets that don't match an
+// existing source line, snap upward to the next one (matches the
+// interpreter's behaviour, where the main loop simply increments lnum until
+// it finds a populated cmdbuf entry).
+function __resolveTarget(t) {
+    if (typeof t === "string" && state.gotoLabels[t] !== undefined) {
+        return state.gotoLabels[t]
+    }
+    let target
+    if (typeof t === "number")    target = t
+    else if (isNumable(t))        target = tonum(t)
+    else throw Error("Invalid jump target: " + t)
+
+    const lines = state.lineList
+    if (lines.length === 0) return [target, 0]
+    // linear scan is fine for the line counts BASIC programs reach
+    for (let i = 0; i < lines.length; i++) {
+        if (lines[i] >= target) return [lines[i], 0]
+    }
+    return [Infinity, 0]
+}
+
+// Invoke a usrdefun (compiled to a JS function), or — when the parser
+// couldn't tell array-indexing apart from function-call (e.g. `A(5)` for an
+// unknown identifier) — index into an array. Used by MAP/FOLD/FILTER, monad
+// operators, and the compiler's default `function` lowering.
+function __runFn(fn, args) {
+    if (typeof fn === "function") return fn.apply(null, args)
+    if (Array.isArray(fn)) return __arrGet(fn, args)
+    if (isMonad(fn) && fn.mType === "funseq") {
+        let arg = args[0]
+        for (let i = 0; i < fn.mVal.length; i++) arg = __runFn(fn.mVal[i], [arg])
+        return arg
+    }
+    throw Error("Not a callable: " + fn)
+}
+
+// ---------------------------------------------------------------------------
+// Operator builtins (where JS doesn't already do the right thing)
+// ---------------------------------------------------------------------------
+
+function _AND(a, b) { if (typeof a !== "boolean" || typeof b !== "boolean") throw Error("Type mismatch"); return a && b }
+function _OR (a, b) { if (typeof a !== "boolean" || typeof b !== "boolean") throw Error("Type mismatch"); return a || b }
+function _NOT(a)    { return !a }
+
+function _CONS(lh, rh) {  // !
+    if (Array.isArray(rh)) return [lh].concat(rh)
+    if (rh && rh.mType === "list") { rh.mVal = [lh].concat(rh.mVal); return rh }
+    throw Error("Type mismatch")
+}
+function _PUSH(lh, rh) {  // ~
+    if (Array.isArray(lh)) return lh.concat([rh])
+    if (lh && lh.mType === "list") { lh.mVal = [lh.mVal].concat([rh]); return lh }
+    throw Error("Type mismatch")
+}
+function _CONCAT(lh, rh) {  // #
+    if (Array.isArray(lh) && Array.isArray(rh)) return lh.concat(rh)
+    if (lh && rh && lh.mType === "list" && rh.mType === "list") return new BasicListMonad(lh.mVal.concat(rh.mVal))
+    throw Error("Type mismatch")
+}
+
+function _TO(from, to)        { return new ForGen(from, to, 1) }
+function _STEP(gen, step) {
+    if (!isGenerator(gen)) throw Error("Type mismatch (STEP)")
+    return new ForGen(gen.start, gen.end, step)
+}
+
+// ---------------------------------------------------------------------------
+// I/O builtins
+// ---------------------------------------------------------------------------
+
+// PRINT(values, seps) — values: array of resolved JS values; seps: array of
+// length values.length-1 with "," | ";" between each consecutive pair.
+// Trailing semicolon? The compiler signals "no newline" by passing a final
+// `null` element in `values` and "noNewline" flag — we use the convention
+// that the LAST entry of `values` being a marker `__noNewline` suppresses
+// the newline (matches basic.js trailing-null behaviour).
+const __PRINT_NONL = Symbol("PRINT_NONL")
+function PRINT(values, seps) {
+    seps = seps || []
+    if (values.length === 0) {
+        println()
+        return
+    }
+    let suppressNewline = false
+    let realLen = values.length
+    if (values[realLen - 1] === __PRINT_NONL) {
+        suppressNewline = true
+        realLen -= 1
+    }
+    for (let i = 0; i < realLen; i++) {
+        if (i >= 1 && seps[i - 1] === ",") print("\t")
+        const v = values[i]
+        let s
+        if (Array.isArray(v))            s = arrayToString(v)
+        else if (v === undefined || v === "") s = ""
+        else if (v.toString !== undefined)    s = v.toString()
+        else                                  s = v
+        print(s)
+    }
+    if (!suppressNewline) println()
+}
+function EMIT(values, seps) {
+    seps = seps || []
+    if (values.length === 0) { println(); return }
+    let suppressNewline = false
+    let realLen = values.length
+    if (values[realLen - 1] === __PRINT_NONL) { suppressNewline = true; realLen -= 1 }
+    for (let i = 0; i < realLen; i++) {
+        if (i >= 1 && seps[i - 1] === ",") print("\t")
+        const v = values[i]
+        if (v === undefined) print("")
+        else if (isNumable(v)) {
+            const c = con.getyx()
+            con.addch(tonum(v))
+            con.move(c[0], c[1] + 1)
+        } else if (v.toString !== undefined) print(v.toString())
+        else print(v)
+    }
+    if (!suppressNewline) println()
+}
+
+function INPUT(promptOrVarname) {
+    print("? ")
+    let r = sys.read().trim()
+    if (!isNaN(r)) r = tonum(r)
+    return r
+}
+function CIN() { return sys.read().trim() }
+
+// ---------------------------------------------------------------------------
+// Numeric builtins
+// ---------------------------------------------------------------------------
+
+const _num = (f) => (x) => { if (!isNumable(x)) throw Error("Type mismatch"); return f(tonum(x)) }
+const _num2 = (f) => (a, b) => {
+    if (!isNumable(a) || !isNumable(b)) throw Error("Type mismatch")
+    return f(tonum(a), tonum(b))
+}
+
+const ABS   = _num(Math.abs)
+const SGN   = _num(x => x > 0 ? 1 : x < 0 ? -1 : 0)
+const INT   = _num(Math.floor)
+const FLOOR = _num(Math.floor)
+const CEIL  = _num(Math.ceil)
+const FIX   = _num(x => x | 0)
+const ROUND = _num(Math.round)
+const SQR   = _num(Math.sqrt)
+const CBR   = _num(Math.cbrt)
+const SIN   = _num(Math.sin)
+const COS   = _num(Math.cos)
+const TAN   = _num(Math.tan)
+const ASN   = _num(Math.asin)
+const ACO   = _num(Math.acos)
+const ATN   = _num(Math.atan)
+const SINH  = _num(Math.sinh)
+const COSH  = _num(Math.cosh)
+const TANH  = _num(Math.tanh)
+const EXP   = _num(Math.exp)
+const LOG   = _num(Math.log)
+const MIN   = _num2((a,b) => a > b ? b : a)
+const MAX   = _num2((a,b) => a < b ? b : a)
+
+function RND(x) {
+    // matches basic.js:1199 — only re-roll when arg !== 0
+    if (!(x === 0)) state.rnd = Math.random()
+    return state.rnd
+}
+
+// ---------------------------------------------------------------------------
+// String builtins
+// ---------------------------------------------------------------------------
+
+function SPC(n)  { return " ".repeat(n) }
+function LEFT(s, n)         { return String(s).substring(0, n) }
+function RIGHT(s, n)        { return String(s).substring(String(s).length - n) }
+function MID(s, start, len) { return String(s).substring(start - state.indexBase, start - state.indexBase + len) }
+function CHR(n)  { return String.fromCharCode(n) }
+
+// ---------------------------------------------------------------------------
+// List builtins
+// ---------------------------------------------------------------------------
+
+function LEN(x)  { if (x === undefined || x.length === undefined) throw Error("Type mismatch"); return x.length }
+function HEAD(x) { if (!x || x.length < 1) throw Error("Type mismatch"); return x[0] }
+function TAIL(x) { if (!x || x.length < 1) throw Error("Type mismatch"); return x.slice(1) }
+function INIT(x) { if (!x || x.length < 1) throw Error("Type mismatch"); return x.slice(0, x.length - 1) }
+function LAST(x) { if (!x || x.length < 1) throw Error("Type mismatch"); return x[x.length - 1] }
+
+function MAP(fn, functor) {
+    if (typeof fn !== "function" && !(isMonad(fn) && fn.mType === "funseq")) throw Error("MAP: not a function")
+    if (isGenerator(functor)) functor = genToArray(functor)
+    if (!Array.isArray(functor)) throw Error("MAP: not iterable")
+    return functor.map(it => __runFn(fn, [it]))
+}
+function FOLD(fn, init, functor) {
+    if (typeof fn !== "function" && !(isMonad(fn) && fn.mType === "funseq")) throw Error("FOLD: not a function")
+    if (isGenerator(functor)) functor = genToArray(functor)
+    if (!Array.isArray(functor)) throw Error("FOLD: not iterable")
+    let akku = init
+    for (let i = 0; i < functor.length; i++) akku = __runFn(fn, [akku, functor[i]])
+    return akku
+}
+function FILTER(fn, functor) {
+    if (typeof fn !== "function" && !(isMonad(fn) && fn.mType === "funseq")) throw Error("FILTER: not a function")
+    if (isGenerator(functor)) functor = genToArray(functor)
+    if (!Array.isArray(functor)) throw Error("FILTER: not iterable")
+    return functor.filter(it => __runFn(fn, [it]))
+}
+
+// Array literal constructor — emitted by the compiler for `[a,b,c]` syntax
+function ARRAY() { return Array.prototype.slice.call(arguments) }
+
+// ---------------------------------------------------------------------------
+// Graphics / system
+// ---------------------------------------------------------------------------
+
+function CLS()   { con.clear() }
+function CLPX()  { graphics.clearPixels(255) }
+function PLOT(x, y, c) { graphics.plotPixel(x, y, c) }
+function GOTOYX(y, x)  { con.move(y + (1 - state.indexBase), x + (1 - state.indexBase)) }
+function TEXTFORE(c)   { print(String.fromCharCode(27, 91) + "38;5;" + (c | 0) + "m") }
+function TEXTBACK(c)   { print(String.fromCharCode(27, 91) + "48;5;" + (c | 0) + "m") }
+function POKE(addr, v) { sys.poke(addr, v) }
+function PEEK(addr)    { return sys.peek(addr) }
+function GETKEYSDOWN() {
+    const keys = []
+    sys.poke(-40, 255)
+    for (let k = -41; k >= -48; k--) keys.push(sys.peek(k))
+    return keys
+}
+
+function CPUT(devnum, msg) { com.sendMessage(devnum, msg); return com.getStatusCode(devnum) }
+function CGET(devnum, ptr) {
+    const msg = com.pullMessage(devnum)
+    const len = msg.length | 0
+    for (let i = 0; i < len; i++) sys.poke(ptr + i, msg.charCodeAt(i))
+    return len
+}
+function CSTA(devnum) { return com.getStatusCode(devnum) }
+
+// ---------------------------------------------------------------------------
+// Type / debug
+// ---------------------------------------------------------------------------
+
+function TYPEOF(v) {
+    if (v === undefined) return "null"
+    if (typeof v === "boolean") return "bool"
+    if (Array.isArray(v)) return "array"
+    if (isGenerator(v)) return "generator"
+    if (isMonad(v)) return v.mType + "-monad"
+    if (typeof v === "function") return "usrdefun"
+    if (isNumable(v)) return "num"
+    if (typeof v === "string") return "string"
+    return typeof v
+}
+
+function OPTIONBASE(n) {
+    if (n != 0 && n != 1) throw Error("Syntax error: OPTIONBASE")
+    state.indexBase = n | 0
+}
+function OPTIONDEBUG(n) { state.debug = (n | 0) === 1 }
+function OPTIONTRACE(n) { state.trace = (n | 0) === 1 }
+
+// ---------------------------------------------------------------------------
+// Monad / functional ops (best-effort port)
+// ---------------------------------------------------------------------------
+
+function MRET(v)  { return new BasicMemoMonad(v) }
+function MLIST(v) { return new BasicListMonad(v) }
+function MJOIN(m) { if (!isMonad(m)) throw Error("Type mismatch"); return m.mVal }
+
+function _BIND(ma, fn) {     // >>=
+    if (!isMonad(ma)) throw Error(">>=: left is not a monad")
+    if (typeof fn !== "function") throw Error(">>=: right is not a function")
+    const mb = __runFn(fn, [ma.mVal])
+    if (!isMonad(mb)) throw Error(">>=: function did not return a monad")
+    return mb
+}
+function _SEQ(ma, mb) {      // >>~
+    if (!isMonad(ma) || !isMonad(mb)) throw Error("Type mismatch")
+    return mb
+}
+function _COMPOSE(fa, fb) {  // .
+    const ma = (typeof fa === "function") ? [fa] : fa.mVal
+    const mb = (typeof fb === "function") ? [fb] : fb.mVal
+    return new BasicFunSeq(mb.concat(ma))
+}
+function _APPLY(fn, value) {  // $
+    return __runFn(fn, [value])
+}
+function _PIPE(value, fn) {   // &
+    return _APPLY(fn, value)
+}
+function _CURRY(fn, value) {  // ~<
+    if (typeof fn !== "function") throw Error("~<: left is not a function")
+    return function() {
+        const rest = Array.prototype.slice.call(arguments)
+        return fn.apply(null, [value].concat(rest))
+    }
+}
+function _SEQAPP(fns, functor) {  // <*>
+    if (!Array.isArray(fns)) throw Error("<*>: first arg must be an array of functions")
+    if (isGenerator(functor)) functor = genToArray(functor)
+    if (!Array.isArray(functor)) throw Error("<*>: not iterable")
+    let ret = []
+    for (let i = 0; i < fns.length; i++) ret = ret.concat(functor.map(it => __runFn(fns[i], [it])))
+    return ret
+}
+function _SEQCURRYMAP(fns, functor) {  // <~>
+    if (typeof fns === "function") fns = [fns]
+    if (!Array.isArray(fns)) throw Error("<~>: first arg must be a function or array of functions")
+    if (isGenerator(functor)) functor = genToArray(functor)
+    if (!Array.isArray(functor)) throw Error("<~>: not iterable")
+    let ret = []
+    for (let i = 0; i < fns.length; i++) ret = ret.concat(functor.map(it => _CURRY(fns[i], it)))
+    return ret
+}
+
+// ---------------------------------------------------------------------------
+// Exports
+// ---------------------------------------------------------------------------
+
+exports = {
+    // state & introspection
+    __state: state, __reset, __data, __labels, __setLines,
+    __PRINT_NONL,
+
+    // operator helpers
+    __add, __div, __intdiv, __mod, __pow, __test,
+    __dim, __arrGet, __arrSet,
+    __forSetup, __forNext, __readData, __resolveTarget,
+    __runFn,
+
+    // type ctors
+    __ForGen: ForGen, __isGenerator: isGenerator, __genToArray: genToArray,
+    __isMonad: isMonad,
+
+    // operators
+    AND: _AND, OR: _OR, NOT: _NOT,
+    UNARYLOGICNOT: _NOT,
+    UNARYBNOT: (a) => ~a,
+    UNARYMINUS: (a) => -a,
+    UNARYPLUS: (a) => +a,
+    BAND: (a,b)=>a&b, BOR: (a,b)=>a|b, BXOR: (a,b)=>a^b,
+    "<<": (a,b)=>a<<b, ">>": (a,b)=>a>>>b,
+    "!": _CONS, "~": _PUSH, "#": _CONCAT,
+    TO: _TO, STEP: _STEP,
+
+    // i/o
+    PRINT, EMIT, INPUT, CIN,
+
+    // numeric
+    ABS, SGN, INT, FLOOR, CEIL, FIX, ROUND, SQR, CBR,
+    SIN, COS, TAN, ASN, ACO, ATN, SINH, COSH, TANH,
+    EXP, LOG, MIN, MAX, RND,
+
+    // strings
+    SPC, LEFT, RIGHT, MID, CHR,
+
+    // lists
+    LEN, HEAD, TAIL, INIT, LAST, MAP, FOLD, FILTER,
+    ARRAY,
+
+    // graphics / system
+    CLS, CLPX, PLOT, GOTOYX, TEXTFORE, TEXTBACK,
+    POKE, PEEK, GETKEYSDOWN, CPUT, CGET, CSTA,
+
+    // type / option
+    TYPEOF, OPTIONBASE, OPTIONDEBUG, OPTIONTRACE,
+
+    // monads / functional
+    MRET, MLIST, MJOIN,
+    ">>=": _BIND, ">>~": _SEQ,
+    ".":   _COMPOSE, "$": _APPLY, "&": _PIPE, "~<": _CURRY,
+    "<*>": _SEQAPP, "<$>": MAP, "<~>": _SEQCURRYMAP,
+
+    // misc
+    DO: function() { return arguments[arguments.length - 1] },
+    CLEAR: function() { state.vars = _initialConsts() },
+    END: function() { /* compiler emits pc=[Infinity,0] */ },
+    LABEL: function() { /* harvested at compile time */ },
+    DATA:  function() { /* harvested at compile time */ },
+    // DIM as an expression (e.g. `WS = DIM(H, V)`): allocate and return a
+    // freshly zero-filled N-D array. The statement form `DIM A(H, V)` is
+    // compiled inline and never reaches this entry.
+    DIM: function() { return __dim(Array.prototype.slice.call(arguments)) },
+}
--- a/it2taud.py
+++ b/it2taud.py
@@ -698,7 +698,7 @@ def encode_note_it(it_note: int) -> int:
        # IT C-5 anchors to Taud C-4, so offset = it_note - 60.
        semis = it_note - 60
        val = round(TAUD_C4 + semis * 4096 / 12)
-        return max(1, min(0xFFFD, val))
+        return max(0x20, min(0xFFFF, val))
    return NOTE_NOP


--- a/mod2taud.py
+++ b/mod2taud.py
@@ -250,7 +250,7 @@ def period_to_taud_note(period: int) -> int:
    if period <= 0:
        return NOTE_NOP
    val = round(TAUD_C4 + 4096.0 * math.log2(PT_REFERENCE_PERIOD / period))
-    return max(1, min(0xFFFD, val))
+    return max(0x20, min(0xFFFF, val))


 # ── PT effect → Taud effect ──────────────────────────────────────────────────
--- a/mon2taud.py
+++ b/mon2taud.py
@@ -139,7 +139,7 @@ def mon_note_to_taud(mon_note: int) -> int:
    if mon_note == 0x7F:
        return NOTE_CUT
    val = TAUD_C4 + round((mon_note - MON_NOTE_C4) * 4096.0 / 12.0)
-    return max(1, min(0xFFFD, val))
+    return max(0x20, min(0xFFFF, val))


 # ── Effect mapping (Monotone 3-bit code + 6-bit data → Taud) ─────────────────
--- a/s3m2taud.py
+++ b/s3m2taud.py
@@ -234,7 +234,7 @@ def encode_note(s3m_note: int) -> int:
        return NOTE_NOP
    semitones = (octave - 4) * 12 + pitch
    val = round(TAUD_C4 + semitones * 4096 / 12)
-    return max(1, min(0xFFFD, val))
+    return max(0x20, min(0xFFFF, val))


 def encode_effect(cmd: int, arg: int, ch: int = 0, row: int = 0,
--- a/taud_common.py
+++ b/taud_common.py
@@ -96,9 +96,9 @@ NUM_VOICES       = 20
 SAMPLE_LEN_LIMIT = 65535

 # Note word sentinels
-NOTE_NOP    = 0xFFFF
-NOTE_KEYOFF = 0x0000
-NOTE_CUT    = 0xFFFE
+NOTE_NOP    = 0x0000
+NOTE_KEYOFF = 0x0001
+NOTE_CUT    = 0x0002
 TAUD_C4     = 0x5000   # The audio engine's Middle C

 # Cue sheet instruction byte (cue offset 30; offset 31 = arg byte for 2-byte forms).
--- a/terranmon.txt
+++ b/terranmon.txt
@@ -2255,7 +2255,7 @@ from source.
        * Semantics (matches IT/Schism player/effects.c:1664-1764 csf_check_nna):
            - Fires on every fresh foreground note trigger on a channel, BEFORE the
              NNA-spawn step that would ghost the existing voice. Does NOT fire on
-              tone portamento, on note-off (0x0000), on note-cut (0xFFFE), or on
+              tone portamento, on note-off (0x0001), on note-cut (0x0002), or on
              empty cells.
            - The DCT/DCA values consulted belong to the EXISTING voice's instrument
              (i.e. the OLD note's instrument, not the incoming note's). Different
@@ -2401,6 +2401,8 @@ TODO:
    [x] GSLINGER order 0x03 chn 1: L 0100 fades unexpectedly fast? — converter fix
    [x] do not reset tickspeed on pattern view play / add key to modify tick speed ('[' down/']' up)
    [x] expose song table on UI (test with `insaniq2.taud`)
+    [x] 0x0000 - no-op; 0x0001 - key-off; 0x0002 - note-cut 0x0010..0x001F - INT0..INTF
+        [ ] establish hooks for the interrupts

 TODO - list of demo songs that MUST ship with Microtone:
    * 4THSYM (rename to Fourth Symmetriad) — excellent piece for demonstrating NNAs and filter envelopes
@@ -2421,13 +2423,14 @@ Play Data: play data are series of tracker-like instructions, visualised as:
 rr||NOTE|Ins|E.Vol|E.Pan|EE.ff|
 63||FFFF|255|3 63|3 63|FF FFFF| (8 bytes per line, 512 bytes per pattern, 128 patterns on 64 kB bank, 32 banks available (pattern 0xFFF -- bank 31, pattern 127 is a sentinel value for no-pattern))

-notes are tuned as 4096 Tone-Equal Temperament. Tuning is set per-sample using their Sampling rate value.
+notes are tuned as 4096 Tone-Equal Temperament. Tuning is set per-sample using their Sampling rate value. 0x1000: C at zeroth octave; 0xF000: C at 14th octave; 0xFFFF: ~C at 15th octave; 0x0000..0x001F: reserved for sentinels (valid playable note range is 0x0020..0xFFFF)

 Special values:

-note 0xFFFF: no-op
-note 0xFFFE: note cut
-note 0x0000: key-off
+note 0x0000: no-op
+note 0x0001: key-off
+note 0x0002: note cut
+note 0x0010..0x001F: Interrupt 0..F (notation: Int0..IntF) — reserved interrupt slots; engine has no default handler.

 inst 0: no instrument change

--- a/tsvm_core/src/net/torvald/tsvm/AudioJSR223Delegate.kt
+++ b/tsvm_core/src/net/torvald/tsvm/AudioJSR223Delegate.kt
@@ -23,7 +23,9 @@ import net.torvald.tsvm.peripheral.MP2Env
 * 8. Call `setCuePosition(playhead, 0)` then `play(playhead)`.
 *
 * Note values: 0x4000 = C3 (sample's native pitch), 4096 steps per octave.
- * Empty row: note = 0xFFFF (no trigger). All 256 instrument slots (0-255) are valid.
+ * Empty row: note = 0x0000 (no trigger). Note sentinels (0x0000..0x001F): 0x0000 = no-op,
+ * 0x0001 = key-off, 0x0002 = note cut, 0x0010..0x001F = Int0..IntF (reserved interrupts).
+ * Valid playable notes are 0x0020..0xFFFF. All 256 instrument slots (0-255) are valid.
 *
 * ## How to upload PCM audio into a playhead
 *
--- a/tsvm_core/src/net/torvald/tsvm/peripheral/AudioAdapter.kt
+++ b/tsvm_core/src/net/torvald/tsvm/peripheral/AudioAdapter.kt
@@ -243,7 +243,7 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
    internal val sampleBin = UnsafeHelper.allocate(SAMPLE_BIN_TOTAL, this)
    @Volatile var sampleBank: Int = 0  // 0..15, controls the 0..524287 window
    internal val instruments = Array(256) { TaudInst(it) }
-    internal val playdata = Array(4096) { Array(64) { TaudPlayData(0xFFFF, 0, 0, 0, 32, 0, 0, 0) } }
+    internal val playdata = Array(4096) { Array(64) { TaudPlayData(0x0000, 0, 0, 0, 32, 0, 0, 0) } }
    internal val playheads: Array<Playhead>
    internal val cueSheet = Array(1024) { PlayCue() }
    internal val pcmBin = arrayOf(
@@ -2275,7 +2275,7 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
                    }

                    TaudPlayData(
-                        note      = if (rawRow.note != 0xFFFF) rawRow.note else src.note,
+                        note      = if (rawRow.note != 0x0000) rawRow.note else src.note,
                        instrment = if (rawRow.instrment != 0) rawRow.instrment else src.instrment,
                        volume    = if (volIsSet) rawRow.volume else src.volume,
                        volumeEff = if (volIsSet) rawRow.volumeEff else src.volumeEff,
@@ -2329,7 +2329,7 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
                // physical_presence ord 0x1F ch2: every row carries `... 1E A0F/A09/A02`)
                // silences after the first row because the slide saturates at 0 and there's
                // nothing to lift the volume back up before the next slide starts.
-                0xFFFF -> {
+                0x0000 -> {
                    if (row.instrment != 0) {
                        voice.instrumentId = row.instrment
                        val seedVol = rowVolumeFromDefault(instruments[voice.instrumentId])
@@ -2345,8 +2345,10 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
                // fadeoutVolume reaches 0, or immediately if FT2-mode fadeStep == 0. Setting
                // voice.active = false here would defeat both — instruments with sustain points
                // and non-zero fadeout (FT2 sustain-then-fade idiom) would be cut on the spot.
-                0x0000 -> { voice.keyOff = true }
-                0xFFFE -> voice.active = false                  // note cut (immediate)
+                0x0001 -> { voice.keyOff = true }
+                0x0002 -> voice.active = false                  // note cut (immediate)
+                in 0x0003..0x000F -> { /* reserved sentinel range, no engine handler */ }
+                in 0x0010..0x001F -> { /* Int0..IntF: reserved interrupt slots, no engine handler yet */ }
                else -> {
                    if (toneG && voice.active) {
                        // Tone porta: target the note, do not retrigger sample.
@@ -2502,7 +2504,7 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
                        1    -> amigaSlideOnce(voice.noteVal, -mag)         // Amiga: subtract from pitch ⇒ adds period
                        2    -> linearFreqSlideOnce(voice.noteVal, -mag)    // Hz/tick: pitch down ⇒ -Hz
                        else -> voice.noteVal - mag                          // linear 4096-TET
-                    }.coerceIn(1, 0xFFFD)
+                    }.coerceIn(0x20, 0xFFFF)
                    voice.basePitch = voice.noteVal
                    voice.amigaPeriod = -1.0   // reseed on next per-tick slide
                    voice.linearFreq  = -1.0
@@ -2521,7 +2523,7 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
                        1    -> amigaSlideOnce(voice.noteVal, mag)
                        2    -> linearFreqSlideOnce(voice.noteVal, mag)
                        else -> voice.noteVal + mag
-                    }.coerceIn(1, 0xFFFD)
+                    }.coerceIn(0x20, 0xFFFF)
                    voice.basePitch = voice.noteVal
                    voice.amigaPeriod = -1.0
                    voice.linearFreq  = -1.0
@@ -2730,7 +2732,7 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
            }
            0x1 -> voice.glissandoOn = (x != 0)
            0x2 -> {
-                voice.noteVal = (voice.noteVal + FINETUNE_OFFSET[x]).coerceIn(1, 0xFFFD)
+                voice.noteVal = (voice.noteVal + FINETUNE_OFFSET[x]).coerceIn(0x20, 0xFFFF)
                voice.basePitch = voice.noteVal
                voice.amigaPeriod = -1.0
                voice.linearFreq  = -1.0
@@ -2832,7 +2834,7 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
                    1    -> amigaSlideTick(voice, voice.slideArg)
                    2    -> linearFreqSlideTick(voice, voice.slideArg)
                    else -> voice.noteVal + voice.slideArg
-                }.coerceIn(1, 0xFFFD)
+                }.coerceIn(0x20, 0xFFFF)
                voice.basePitch = voice.noteVal
            }

@@ -2854,7 +2856,7 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
                        voice.noteVal = target
                        voice.tonePortaTarget = -1
                    } else {
-                        voice.noteVal = freqHzToNoteVal(voice.linearFreq).coerceIn(1, 0xFFFD)
+                        voice.noteVal = freqHzToNoteVal(voice.linearFreq).coerceIn(0x20, 0xFFFF)
                    }
                    voice.basePitch = voice.noteVal
                    voice.amigaPeriod = -1.0
@@ -2912,14 +2914,14 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
            if (voice.vibratoActive) {
                val sine = lfoSample(voice.vibratoLfoPos, voice.vibratoWave)
                val pitchDelta = (sine * voice.mem.huDepth) shr voice.vibratoFineShift
-                pitchToMixer = (voice.noteVal + pitchDelta).coerceIn(1, 0xFFFD)
+                pitchToMixer = (voice.noteVal + pitchDelta).coerceIn(0x20, 0xFFFF)
                voice.vibratoLfoPos = (voice.vibratoLfoPos + voice.mem.huSpeed * 4) and 0xFF
            }

            // Glissando (S$1x) — snap pitchToMixer to nearest semitone but leave noteVal smooth.
            if (voice.glissandoOn) {
                val semis = ((pitchToMixer * 12 + 2048) / 4096)
-                pitchToMixer = (semis * 4096 / 12).coerceIn(1, 0xFFFD)
+                pitchToMixer = (semis * 4096 / 12).coerceIn(0x20, 0xFFFF)
            }

            // Tremolo (R) — modulates rowVolume around the per-note volume base. IT's tremolo
@@ -2946,7 +2948,7 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
            if (voice.arpActive) {
                val voiceIdx = ts.tickInRow % 3
                val arpDelta = when (voiceIdx) { 1 -> voice.arpOff1 shl 8; 2 -> voice.arpOff2 shl 8; else -> 0 }
-                pitchToMixer = (voice.basePitch + arpDelta).coerceIn(1, 0xFFFD)
+                pitchToMixer = (voice.basePitch + arpDelta).coerceIn(0x20, 0xFFFF)
                voice.lastArpVoice = voiceIdx
            }

@@ -2983,7 +2985,7 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
                ((voice.envPfValue - 0.5) * 2.0 * 16.0 * 4096.0 / 12.0).toInt()
            else 0

-            val finalPitch = (pitchToMixer + autoVibDelta + pitchEnvDelta).coerceIn(1, 0xFFFD)
+            val finalPitch = (pitchToMixer + autoVibDelta + pitchEnvDelta).coerceIn(0x20, 0xFFFF)
            voice.playbackRate = computePlaybackRate(inst, finalPitch)

            // Filter envelope (filter mode): scale baseCut by envValue (0..1, 0.5 = unity).
@@ -3087,7 +3089,7 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
            val pitchEnvDelta = if (bg.hasPfEnv && bg.pfEnvOn && !bg.envPfIsFilter)
                ((bg.envPfValue - 0.5) * 2.0 * 16.0 * 4096.0 / 12.0).toInt()
            else 0
-            val finalPitch = (bg.noteVal + autoVibDelta + pitchEnvDelta).coerceIn(1, 0xFFFD)
+            val finalPitch = (bg.noteVal + autoVibDelta + pitchEnvDelta).coerceIn(0x20, 0xFFFF)
            bg.playbackRate = computePlaybackRate(inst, finalPitch)
            // Filter-mode pf envelope: same scaling rule as foreground.
            if (bg.hasPfEnv && bg.pfEnvOn && bg.envPfIsFilter) {
@@ -3603,7 +3605,7 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
        var randomPanBias = 0              // signed

        // Pitch state (4096-TET units, signed when slid).
-        var noteVal = 0xFFFF               // The currently sounding base note (no per-row vibrato/arp added)
+        var noteVal = 0x0000               // The currently sounding base note (no per-row vibrato/arp added); 0 = none yet
        var basePitch = 0x4000             // Saved pre-effect pitch for vibrato/arp/glissando overlay
        // Amiga-mode period state, persisted across ticks so multi-tick E/F slides don't lose
        // sub-noteVal precision through repeated round-trip rounding (see amigaSlideTick).
@@ -3965,7 +3967,7 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
                    it.hasPfEnv = false; it.envPfIsFilter = false
                    it.fadeoutVolume = 1.0
                    it.rampOutSamples = 0; it.rampOutGain = 0.0; it.rampOutStep = 0.0
-                    it.noteVal = 0xFFFF; it.basePitch = 0x4000
+                    it.noteVal = 0x0000; it.basePitch = 0x4000
                    it.amigaPeriod = -1.0; it.linearFreq = -1.0
                    it.tonePortaTarget = -1; it.tonePortaSpeed = 0
                    it.filterY1 = 0.0; it.filterY2 = 0.0
--- a/tsvm_core/src/net/torvald/tsvm/peripheral/TestDiskDrive.kt
+++ b/tsvm_core/src/net/torvald/tsvm/peripheral/TestDiskDrive.kt
@@ -561,7 +561,10 @@ class TestDiskDrive(private val vm: VM, private val driveNum: Int, theRootPath:
                statusCode.set(STATE_CODE_STANDBY)
            }
            else if (inputString.startsWith("USAGE")) {
-                recipient?.writeout(composePositiveAns("USED123456/TOTAL654321"))
+                val used = rootPath.walkTopDown().filter { it.isFile }.map { it.length() }.sum()
+                    .coerceIn(0L, Int.MAX_VALUE.toLong())
+                val total = rootPath.totalSpace.coerceIn(0L, Int.MAX_VALUE.toLong())
+                recipient?.writeout(composePositiveAns("USED$used/TOTAL$total"))
                statusCode.set(STATE_CODE_STANDBY)
            }
            else
--- a/xm2taud.py
+++ b/xm2taud.py
@@ -387,7 +387,7 @@ def encode_note_xm(xm_note: int) -> int:
    if 1 <= xm_note <= 96:
        semis = xm_note - XM_RELNOTE_C4
        val = round(TAUD_C4 + semis * 4096 / 12)
-        return max(1, min(0xFFFD, val))
+        return max(0x20, min(0xFFFF, val))
    return NOTE_NOP
Author	SHA1	Message	Date
minjaesong	1d28c89937	taut: global flag editor	2026-05-17 23:18:06 +09:00
minjaesong	61524b3685	TVDOS: userconfigpath and zfmrc	2026-05-17 00:25:40 +09:00
minjaesong	e6f77c4789	Taud: sentinel values moved to negative octave range	2026-05-16 19:33:17 +09:00
minjaesong	00c0e18c1a	TVDOS: minor improvements	2026-05-16 12:26:45 +09:00
minjaesong	135c7b9c4e	TVDOS: NodeJS style libfs	2026-05-15 23:36:14 +09:00
minjaesong	295c1f7fe2	TVDOS: path for require()	2026-05-15 23:35:38 +09:00
minjaesong	e74a373605	taut.js: minor UI improvements	2026-05-15 23:35:12 +09:00
minjaesong	b1a0a9f801	TerranBASIC to JS compiler that needs TVDOS	2026-05-15 20:15:07 +09:00
minjaesong	bdc2578072	new coreutils which/where	2026-05-15 20:13:50 +09:00