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gen_audio.py: a numpy synthesis engine (osc / ADSR / filters / reverb /
seamless-loop crossfade + note sequencer + drum synth). Renders 6 ambience
beds (street day/night, rain, 3 interior roomtones) + 13 sfx (doorbell,
door, till, record-riffle, toast, tram bell/rumble, 6 footsteps) + 4
instrumental 90s music loops (record-shop, milkbar, video-synth, arcade)
-> web/assets/audio/ as OGG/Opus + M4A/AAC. 8.1 MB of the 25 MB budget.
Tool = 100% procedural synthesis (not a neural model): $0, deterministic/
seeded, perfectly loopable, parody-safe by construction. Documented in
README (§ audio) + AUDIT.md provenance.
manifest audio:{ambience,sfx,music} — file + m4a fallback + loop + gain;
interior roomtone/music carry types[] (seed-pick per shop, like facades);
footstep is {surface:[variants]}. build_manifest.py builds it,
validate_manifest.py checks it. qa.sh --strict green (audio 23, 0 err).
Verified technically (peaks <= -0.4 dBFS, all loops seamless, durations)
via spectrogram sheet + numeric — subjective ear-check is John's/F's.
E leads the audio round; F owns the v2.1 tag + push. Not pushed.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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