diff --git a/assets/disk0/tvdos/include/taud.mjs b/assets/disk0/tvdos/include/taud.mjs
index f478ae5..2513919 100644
--- a/assets/disk0/tvdos/include/taud.mjs
+++ b/assets/disk0/tvdos/include/taud.mjs
@@ -118,7 +118,7 @@ function uploadTaudFile(inFile, songIndex, playhead) {
     let patBinCompSize   = _peekU32LE(filePtr, entryOff + 18)
     let cueSheetCompSize = _peekU32LE(filePtr, entryOff + 22)
 
-    let bpm        = bpmStored + 24
+    let bpm        = bpmStored + 25
     let patsToLoad = numPatsLo | (numPatsHi << 8)
 
     // -- 6. Decompress + upload patterns --------------------------------------
@@ -210,7 +210,7 @@ function captureTrackerDataToFile(outFile) {
     // -- 3. BPM / tick-rate / volumes from playhead 0 -------------------------
     let bpm      = audio.getBPM(0)      || 125
     let tickRate = audio.getTickRate(0) || 6
-    let bpmStored = (bpm - 24) & 0xFF
+    let bpmStored = (bpm - 25) & 0xFF
     let songGlobalVolume = audio.getSongGlobalVolume(0)
     let songMixingVolume = audio.getSongMixingVolume(0)
     if (songGlobalVolume === undefined || songGlobalVolume === null) songGlobalVolume = 0x80
@@ -272,7 +272,7 @@ function captureTrackerDataToFile(outFile) {
         (songOffset >>> 24) & 0xFF,
         20,                                    // numVoices
         numPats & 0xFF, (numPats >>> 8) & 0xFF, // numPatterns Uint16 LE
-        bpmStored,                             // BPM with −24 bias
+        bpmStored,                             // BPM with −25 bias
         tickRate,                              // initial tick-rate
         0x00,0xA0,                             // basenote (0xA000 -- C9)
         0x00,0xAC,0x02,0x46,                   // basefreq (8363 Hz)
diff --git a/terranmon.txt b/terranmon.txt
index 0758614..2c61437 100644
--- a/terranmon.txt
+++ b/terranmon.txt
@@ -2728,8 +2728,8 @@ prefixes:
     Uint32  Size of this notation following this field
     Uint16  Reserved for flags
     Uint16  Interval size in 4096-TET lattice (octave = 0x1000, tritave = 0x195C). If you are not using an interval system (which means you are responsible for defining every note expressible), this must be 0.
-    Uint16  Reserved
-    Uint16  Notes between interval MINUS ONE (or octave); 12-TET will have value 11
+    Uint16  Reserved for float32 interval size (should it be in 4096-TET which is inexact or frequency multiplier which is exact but difficult to implement?)
+    Uint16  Notes between interval (or octave) MINUS ONE; 12-TET will have value 11
     Byte[8] Reserved
     Byte[*]     Name, null terminated. Encoding: UTF-8
     Byte[*]     Notation table. 0xFF-separated and null-terminated. Encoding: Taud charset