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BPM is now 25..280

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minjaesong
2026-05-08 20:40:25 +09:00
parent ed3bbb6ffe
commit 8e6f597e9b
9 changed files with 31 additions and 31 deletions
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10
terranmon.txt
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@@ -2456,7 +2456,7 @@ Play Head Flags
made by songs will not persist.
Panning law is fixed to the equal-energy; there is no runtime selection.
Byte 3 (Tracker Mode)
- BPM (24 to 279. Play Data will change this register)
- BPM (25 to 280. Play Data will change this register)
Byte 4 (Tracker Mode)
- Tick Rate (Play Data will change this register)
@@ -2486,8 +2486,8 @@ Play Head Flags
Table of 3.5 Minifloat values (CSV).
Rebiased 2026-05-07 so the smallest non-zero step is 1/256 s and the maximum
is 15.75 s — every cell is the original LUT value divided by 8. Chosen for
tracker envelopes: a single song tick (≈ 8.9 ms at BPM 280, ≈ 41.7 ms at
BPM 24) now lands within ±17 % of an LUT entry across the whole supported
tracker envelopes: a single song tick (≈ 8.9 ms at BPM 280, ≈ 100 ms at
BPM 25) now lands within ±17 % of an LUT entry across the whole supported
BPM range; the previous bias was ±150 % at common BPMs.
,000,001,010,011,100,101,110,111,MSB
00000,0,0.125,0.25,0.5,1,2,4,8
@@ -2568,7 +2568,7 @@ Endianness: Little
Uint32 Song offset
Uint8 Number of voices
Uint16 Number of patterns (0 is invalid. pattern bin length = numPats * 8 bytes)
Uint8 Initial BPM (bias of -24. 0x00=24, 0xFF=279)
Uint8 Initial BPM (bias of -25. 0x00=25, 0xFF=280)
Uint8 Initial Tickrate (0 is invalid)
Uint16 Current Tuning base note (1..65533). A4 (western default) is 0x5C00. C9 (tracker default) is 0xA000. If zero, assume the tracker default value
Float32 Frequency at the base note. Tracker default is 8363.0. If zero, assume the tracker default
@@ -2738,7 +2738,7 @@ The halt instruction (byte value 0x01 at cue offset 30) is placed on the last ac
## Tempo mapping
S3M BPM is stored as a raw decimal value. Taud's initial BPM byte uses a bias of -24 (byte 0x00 = 24 BPM, 0xFF = 279 BPM). Conversion: taud_byte = bpm - 24. The converter also scans row 0 of the first pattern in the order list for A (set speed) and T (set tempo) effects and uses those values in preference to the S3M header defaults.
S3M BPM is stored as a raw decimal value. Taud's initial BPM byte uses a bias of -25 (byte 0x00 = 25 BPM, 0xFF = 280 BPM). Conversion: taud_byte = bpm - 25. The converter also scans row 0 of the first pattern in the order list for A (set speed) and T (set tempo) effects and uses those values in preference to the S3M header defaults.
## Global volume