RX-7 audio v2: turbo whistle + exhaust from the action-cam library

- Scanned b-action-cam-footage/clipchamp (99GB, 5 videos of the FD):
  extracted audio NAS-side via linuxserver/ffmpeg container (stream-copy),
  scanned 69min return drive per-second for engine tonality + whistle
  prominence (1.5-9kHz peak vs band median)
- New rev loop: 985-993s highway pull — 0.0Hz pitch drift over 8s,
  whistle ~1.7kHz at +33dB, exhaust + turbo captured together (seam 0.001)
- New whistle-only loop: same pull high-passed 1.2kHz — isolated spool
- SoundController: optional per-car Whistle layer that rides boost
  (throttle held at speed): fades in past 25% speed, pitch 0.9->1.35
- ROTARY_SOUND.md updated; three .ogg uploads needed in Studio now

docs/ROTARY_SOUND.md

@@ -1,23 +1,27 @@
 ## Status: loops are BUILT ✅ — awaiting Studio upload
 
-Real 13B loops were extracted from the owner's own drive footage
-(`/mnt/user/data/c-finished-videos/2026-07-10/`, same car) and processed on the
-workstation. They live at:
+Real 13B loops extracted from the owner's own footage. **v2**: rev + turbo
+whistle now come from the action-cam library
+(`/mnt/user/data/b-action-cam-footage/clipchamp/`, 99 GB scanned — same car),
+which captured the turbo + exhaust together far better than the first source.
 
 - `assets/audio/rx7_idle_loop.ogg` — 15.9 s steady idle (~99 Hz fundamental,
-  scanned as the most tonally stable stretch of the session; seam jump 0.001)
-- `assets/audio/rx7_rev_loop.ogg` — 7.4 s held higher-RPM pull (~105 Hz,
-  louder section; seam jump 0.005)
+  from the 2026-07-10 session; seam jump 0.001)
+- `assets/audio/rx7_rev_loop.ogg` — 7.9 s whistle-rich highway pull (~124 Hz,
+  from 20260510-Return..., window 985-993 s: 0.0 Hz pitch drift across 8 s,
+  turbo whistle ~1.7 kHz riding +33 dB over the band; seam jump 0.001)
+- `assets/audio/rx7_whistle_loop.ogg` — the SAME pull high-passed at 1.2 kHz:
+  isolated turbo whistle, layered in-game on top of the rev loop and faded
+  in/up with "boost" (throttle held at speed) for the authentic spool sound
 - Masters (`.wav` + `.ogg`) mirrored to the NAS:
   `.../001-1993 Mazda RX-7/sound/`
 
-**Remaining (owner, in Studio): upload the two `.ogg` files** (Asset Manager →
-Import, or Creator Dashboard → Audio), wait for moderation, then paste the two
+**Remaining (owner, in Studio): upload the three `.ogg` files** (Asset Manager →
+Import, or Creator Dashboard → Audio), wait for moderation, then paste the three
 asset IDs into `CAR_SOUNDS.rx7_fc` in `src/client/SoundController.luau`.
 
-If a longer/angrier rev is wanted later, more source material exists in the
-other sessions under `c-finished-videos/` — the extraction is repeatable
-(method below).
+More source material exists in the other clipchamp sessions — the extraction is
+repeatable (method below).
 
 ---