From 577d46d31e5a83543a5944d51d7d670de352e946 Mon Sep 17 00:00:00 2001
From: minjaesong <alswo9628@gmail.com>
Date: Tue, 12 May 2026 23:35:42 +0900
Subject: [PATCH] keys to change playback tickrate

---
 assets/disk0/tvdos/bin/taut.js                   | 16 ++++++++++++++--
 assets/disk0/tvdos/bin/taut_helpmsg.js           |  1 +
 terranmon.txt                                    |  2 +-
 .../net/torvald/tsvm/peripheral/AudioAdapter.kt  |  1 +
 4 files changed, 17 insertions(+), 3 deletions(-)

diff --git a/assets/disk0/tvdos/bin/taut.js b/assets/disk0/tvdos/bin/taut.js
index 8243124..01a2d18 100644
--- a/assets/disk0/tvdos/bin/taut.js
+++ b/assets/disk0/tvdos/bin/taut.js
@@ -1555,6 +1555,8 @@ function timelineInput(wo, event) {
     if (keyJustHit && shiftDown && event.includes(keys.E)) { setTimelineRowStyle(1); return }
     if (keyJustHit && shiftDown && event.includes(keys.R)) { setTimelineRowStyle(2); return }
 
+    if (keyJustHit && (keysym === '[' || keysym === ']')) { nudgeTickRate(keysym === '[' ? -1 : 1); return }
+
     if (playbackMode !== PLAYMODE_NONE) {
         if (keyJustHit && shiftDown && event.includes(keys.Y) || keysym === " ") { stopPlayback(); redrawPanel(); drawAlwaysOnElems() }
         else if (keysym === "<LEFT>" || keysym === "<RIGHT>") {
@@ -2188,6 +2190,8 @@ function patternsInput(wo, event) {
     const shiftDown  = (event.includes(59) || event.includes(60))
     const moveDelta  = shiftDown ? 4 : 1
 
+    if (keyJustHit && (keysym === '[' || keysym === ']')) { nudgeTickRate(keysym === '[' ? -1 : 1); return }
+
     if (playbackMode !== PLAYMODE_NONE) {
         if ((keyJustHit && shiftDown && event.includes(keys.Y)) || keysym === " ") {
             stopPlayback(); simStateKey = ''; drawPatternsContents(wo); drawAlwaysOnElems()
@@ -2346,6 +2350,16 @@ function restoreFullSongParams() {
     previewActive = false
 }
 
+// Adjust the live tick rate by `delta`. The engine still honours 'A' (set speed) effects,
+// which will overwrite this value when their row is hit during playback.
+function nudgeTickRate(delta) {
+    const cur = audio.getTickRate(PLAYHEAD) | 0
+    const next = Math.max(1, Math.min(255, cur + delta))
+    if (next === cur) return
+    audio.setTickRate(PLAYHEAD, next)
+    drawAlwaysOnElems()
+}
+
 function startPlaySong() {
     restoreFullSongParams()
     audio.stop(PLAYHEAD)
@@ -2392,7 +2406,6 @@ function startPlayPattern() {
     if (song.numPats === 0) return
     audio.stop(PLAYHEAD)
     audio.setBPM(PLAYHEAD, song.bpm)
-    audio.setTickRate(PLAYHEAD, song.tickRate)
     audio.uploadCue(PREVIEW_CUE_IDX, buildPreviewCue(patternIdx))
     audio.setCuePosition(PLAYHEAD, PREVIEW_CUE_IDX)
     audio.setTrackerRow(PLAYHEAD, 0)
@@ -2408,7 +2421,6 @@ function startPlayPatternRow() {
     if (song.numPats === 0) return
     audio.stop(PLAYHEAD)
     audio.setBPM(PLAYHEAD, song.bpm)
-    audio.setTickRate(PLAYHEAD, song.tickRate)
     audio.uploadCue(PREVIEW_CUE_IDX, buildPreviewCue(patternIdx))
     audio.setCuePosition(PLAYHEAD, PREVIEW_CUE_IDX)
     audio.setTrackerRow(PLAYHEAD, patternGridRow)
diff --git a/assets/disk0/tvdos/bin/taut_helpmsg.js b/assets/disk0/tvdos/bin/taut_helpmsg.js
index 4526665..141835c 100644
--- a/assets/disk0/tvdos/bin/taut_helpmsg.js
+++ b/assets/disk0/tvdos/bin/taut_helpmsg.js
@@ -90,6 +90,7 @@ Timeline has two distinct modes: view and edit mode. Two modes are toggled using
 &bul;<b>W</b>&mdot;<b>E</b>&mdot;<b>R</b> : <O>toggle timeline view mode. W-most detailed, R-most abridged</O>
 &bul;<b>n</b> : <O>toggle soloing of the selected voice</O>
 &bul;<b>m</b> : <O>toggle muting of the selected voice</O>
+&bul;<b>[</b>&mdot;<b>]</b> : <O>change tick rate of playhead</O> 
 
 <b>&nbsp;EDIT MODE</b>
 <b>\u00B7${'\u00B8'.repeat(9)}\u00B9</b>
diff --git a/terranmon.txt b/terranmon.txt
index afd431b..d1ce314 100644
--- a/terranmon.txt
+++ b/terranmon.txt
@@ -2399,7 +2399,7 @@ TODO:
         previous "row volume default = 63" behaviour.
     [x] physical_presence order 0x1F chn 2: note cuts unexpectedly fast — engine fix
     [x] GSLINGER order 0x03 chn 1: L 0100 fades unexpectedly fast? — converter fix
-    [ ] do not reset tickspeed on pattern view play / add key to modify tick speed ('[' down/']' up)
+    [x] do not reset tickspeed on pattern view play / add key to modify tick speed ('[' down/']' up)
     [ ] expose song table on UI (test with `insaniq2.taud`)
 
 TODO - list of demo songs that MUST ship with Microtone:
diff --git a/tsvm_core/src/net/torvald/tsvm/peripheral/AudioAdapter.kt b/tsvm_core/src/net/torvald/tsvm/peripheral/AudioAdapter.kt
index 35c5eff..e407842 100644
--- a/tsvm_core/src/net/torvald/tsvm/peripheral/AudioAdapter.kt
+++ b/tsvm_core/src/net/torvald/tsvm/peripheral/AudioAdapter.kt
@@ -3410,6 +3410,7 @@ class AudioAdapter(val vm: VM) : PeriBase(VM.PERITYPE_SOUND) {
         var samplePos = 0.0
         var playbackRate = 1.0
         var forward = true
+        var instrumentId = 0
 
         // -1 for live foreground voices held by TrackerState.voices[]; 0..19 for background
         // (mixer-private) ghosts spawned by NNA on the matching channel index.