Every WAV is synthesized from maths by tools/gen_sounds.py (run through Blender
for its bundled numpy) -- sines, noise and envelopes, seeded and reproducible,
licence-free by construction. Loops (engine, skid, boost, siren) are built from
integer-Hz components over exactly 1 s so the seam is mathematically silent;
noise beds get a crossfaded seam. Seam continuity is verified numerically.
Wiring: pitch-tracked engine loop on every car (idle burble to top-end scream,
bump while boosting), skid loop off slip, player boost whoosh, small/big crash
by jolt with glass on wrecks, two-tone siren on pursuit cops (derby brawlers
stay silent), Crashbreaker boom, gearbox clunk/bog, win/lose stings on
takedowns, outruns, escapes, busts and derby eliminations.
Loop flags live in code (sfx.gd), not per-file .import settings, so a
regenerated wav never silently loses its loop.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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