
arcattackandClaude Opus 4.8
691e88569a
Audio Phase 2 (AUDIO_FIDELITY F1/F2/F13/F14): full-zone soundbank -- key-splits,
layers, baked tuning, loop regions, release fades
Extractor rewrite (tools/sf2extract.py): every sample-bearing instrument zone
becomes a SAMPLEINFO slot -- 603 zones / 241 presets (68/115 + 94/126 multi-
zone, matching the audit exactly). Per zone: keyRange(43), sampleModes(54),
SBK samplePitch(55) + rootKey(58) + coarse/fineTune(51/52), attenuation(48,
INVERTED SBK scale, 0.375 dB/step [T3], baked into the PCM), releaseVolEnv(38),
pan(17), shdr loop region.
F2 pitch (algebraically exact): WAV rate = round(44100 * 2^(((6000 -
rootCents) + tune)/1200)) -- EMU8000 v1 base 44100. Cross-checks: FootFall
17300 Hz (the audit's +4.2 st), MissileLoaded low zone 88200 (-24 st),
Warnings01 8-way klaxon split w/ 3 looped zones, Death01 162 Hz extremes.
F1 zone selection: SetupPatch/PlayNote take the authored note;
attach/play only zones whose [keyLo,keyHi] contains it (detach the rest so a
rewound source can't replay a stale buffer). Live-verified: LaserLoaded/
MissileLoaded note 36 -> low clunk zone, note 84 -> high blip zone (pitch 4);
LaserCFire plays all 3 authored layers incl the looping sustain. Stereo-pair
zones pan via listener-relative AL_POSITION (distance model is AL_NONE).
MAX_PRESET_SAMPLES=25 (AllExplosion); fixed PRESET_isImplemented's >=5 bound.
F13 loops + releases: authored [loopStart,loopEnd] applied via
AL_SOFT_loop_points at buffer load (0 rejections; kills the latent boom-loop
on MechExplosion's 1.5% sustain slice + the ~2.4 Hz LaserBSustain wrap tick);
StopNote now honors the authored releaseVolEnv (1.1-3.9 s on ~20 looping
presets) with a dB-linear fade serviced from AudioHead::Execute; restarts
reclaim fading sources. One-shots keep the instant stop (faithful).
Regression (40s drive+fire): stable, loop points accepted, key-splits + layers
verified in the delivery trace, chirp still dead, footfalls fire.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
2026-07-16 11:04:34 -05:00
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