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XM gating behaviour with no volenv and key-off (converter manages it)

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minjaesong
2026-05-08 02:52:32 +09:00
parent 3182ae9146
commit e49140902b
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terranmon.txt
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@@ -2347,7 +2347,9 @@ TODO:
replacing the full-panel redraw on every keystroke.
[x] volume and panning policy to match note effect policy: when note is "retriggerred" (note command with instrument specified), the volume/pan must take default value; if not (note command with instrument 0) the volume/pan must stay at the old value. Make both audio engine and taut.js simulator changes.
[ ] xm volume column commands (+x, -x, Dx, Lx, Mx, Px, Rx, Sx, Ux, Vx) are completely ignored
[ ] theday.xm order 0x28, channel 6..8 has 'note trigger with inst 1 but no volume -> key-off -> set-volume to 0x20 -> key-off -> set-volume to 0x10 -> key-off -> ...' and it sounds like gating: key-off silences the output, set-volume turns on the output again; notably, this behaviour only works when volume envelope is turned off (any fadeouts progress normally). What I want to know before implementing this feature is that would the way it works on XM conflicts with Taud or ImpulseTracker's behaviour
[x] theday.xm order 0x28, channel 6..8 has 'note trigger with inst 1 but no volume -> key-off -> set-volume to 0x20 -> key-off -> set-volume to 0x10 -> key-off -> ...' and it sounds like gating: key-off silences the output, set-volume turns on the output again; notably, this behaviour only works when volume envelope is turned off (any fadeouts progress normally). FT2's keyOff (ft2_replayer.c:411-435) zeroes realVol/outVol when the volume envelope is disabled — IT/Schism does not, and Taud's engine follows IT semantics (no fade when fadeStep == 0). Resolved in xm2taud.py: a pre-pass tracks per-channel bound XM instrument across the order-list walk, and any key-off cell whose bound instrument has vol_env_type & XM_ENV_ON == 0 is paired with `SEL_SET vol=0` in the same row. A subsequent vol-col SET on the channel restores audibility — exactly mirroring FT2's outVol/realVol gate without diverging the engine. Engine semantics stay IT-pure.
[ ] remove panning mode selection and replace global panning rule to 3 dB rule (not the equal energy)
[ ] FT2/MOD double effects (5xx, 6xx) missing volume column -> easiest solution: fully implement `L xy00` and `K xy00` and map 5xx to L, 6xx to K (xm2taud, mod2taud), Kxy and Lxy verbatim (s3m2taud.py, it2taud.py)
Play Data: play data are series of tracker-like instructions, visualised as: