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Panbrello is 'Y' not 'W', oops

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minjaesong
2026-04-24 09:21:10 +09:00
parent 3d99568359
commit 6d70960e5c
2 changed files with 25 additions and 23 deletions
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TAUD_NOTE_EFFECTS.md
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@@ -493,27 +493,27 @@ A tempo slide's memory slot is separate from the set-tempo path and is private t
---
## W $xxyy — Panbrello (panning vibrato) with speed $xx and depth $yy
## Y $xxyy — Panbrello (panning vibrato) with speed $xx and depth $yy
**Plain.** Modulates panning with an LFO, symmetrically with H's pitch modulation. `$xx` is LFO speed, `$yy` depth; the waveform is selected by S $4x.
**Plain.** Modulates panning with an LFO, symmetrically with H's pitch modulation. `$xx` is LFO speed, `$yy` depth; the waveform is selected by S $5x.
**Compatibility.** IT `Wxy` uses nibbles; convert by nibble-repeat. IT's volume cap is $40; Taud's is $3F — very deep vibrato that would have briefly clipped at $40 in IT may clip slightly earlier in Taud. W has its own memory slot.
**Compatibility.** IT `Yxy` uses nibbles; convert by nibble-repeat. IT's panning cap is $40; Taud's is $3F — very deep vibrato that would have briefly clipped at $40 in IT may clip slightly earlier in Taud. Y has its own memory slot.
**Implementation.** Identical machinery to H with a larger shift to fit the narrower volume range:
```
on row parse (W):
if (arg >> 8) != 0: memory_W.speed = arg >> 8
if (arg & $FF) != 0: memory_W.depth = arg & $FF
on row parse (Y):
if (arg >> 8) != 0: memory_Y.speed = arg >> 8
if (arg & $FF) != 0: memory_Y.depth = arg & $FF
on every tick (including tick 0):
sine = ModSinusTable[(lfo_pos >> 2) & $3F]
vol_delta = (sine × memory_W.depth) >> 9
vol_delta = (sine × memory_Y.depth) >> 9
applied_vol = clamp(base_vol + vol_delta, 0, $3F)
lfo_pos = (lfo_pos + memory_W.speed × 4) & $FF
lfo_pos = (lfo_pos + memory_Y.speed × 4) & $FF
```
Peak at maximum settings: $7F × $FF >> 9 = $3F — the full panning range. Retrigger behaviour tracks the S $4x waveform nibble bit 2: cleared means retrigger on new note, set means preserve LFO position.
Peak at maximum settings: $7F × $FF >> 9 = $3F — the full panning range. Retrigger behaviour tracks the S $5x waveform nibble bit 2: cleared means retrigger on new note, set means preserve LFO position.
---
@@ -595,11 +595,11 @@ ProTracker `E5x` maps to Taud `S $2x00` with the same index meaning.
## S $5x00 — Panbrello LFO waveform
**Plain.** Selects the shape of the panbrello (W) oscillator; value encoding is identical to S $3x.
**Plain.** Selects the shape of the panbrello (Y) oscillator; value encoding is identical to S $3x.
**Compatibility.** IT `S5x` maps directly.
**Implementation.** As for S $3x, but applied to W's separate state (`panbrello_waveform`, `panbrello_retrigger`, and panbrello `lfo_pos`).
**Implementation.** As for S $3x, but applied to Y's separate state (`panbrello_waveform`, `panbrello_retrigger`, and panbrello `lfo_pos`).
---