Merge branch 'flow/m3te/P10.5' into m3te-plan

assets/audio/LICENSE.txt

@@ -1,31 +1,46 @@
 m3te sound effects
 ==================
 
-clear.wav — "confirmation_001" from Kenney's Interface Sounds pack
-(www.kenney.nl), licensed CC0 1.0 (public domain):
-https://creativecommons.org/publicdomain/zero/1.0/
+Every cue is a real, free-licensed (CC0 1.0, public domain) sound effect from
+Kenney (www.kenney.nl), processed to the format iOS System Sound Services loads
+directly via audio.sx: WAVE / mono / 44100 Hz / signed-16-bit PCM. The whole
+bank is peak-normalized to a quiet -9 dBFS (System Sound Services has no runtime
+volume, so loudness is baked into the file) — measurably quieter and cleaner
+than the previous synthesized bank.
 
-Converted to mono 44.1 kHz signed-16-bit PCM WAV (afconvert) — the format
-iOS System Sound Services loads directly via audio.sx.
+CC0 1.0: https://creativecommons.org/publicdomain/zero/1.0/
 
+Per-file provenance
+-------------------
 
-Candy-vibe SFX bank (P10.1)
----------------------------
+swap.wav    — "pluck_002" from Kenney "Interface Sounds" (CC0)
+              https://kenney.nl/assets/interface-sounds
+match.wav   — "confirmation_002" from Kenney "Interface Sounds" (CC0)
+              https://kenney.nl/assets/interface-sounds
+win.wav     — "powerUp7" from Kenney "Digital Audio" (CC0)
+              https://kenney.nl/assets/digital-audio
+lose.wav    — "minimize_006" from Kenney "Interface Sounds" (CC0)
+              https://kenney.nl/assets/interface-sounds
 
-swap.wav, match.wav, combo1.wav .. combo5.wav, win.wav, lose.wav
+combo1.wav .. combo5.wav — "glass_001" from Kenney "Interface Sounds" (CC0)
+              https://kenney.nl/assets/interface-sounds
+              The single glass-bell sample is pitch-laddered up a pentatonic run
+              (0, +2, +4, +7, +9 semitones) by real resample DSP (ffmpeg
+              asetrate/aresample), so the cascade cue ascends in pitch with
+              cascade depth. Measured fundamentals (tools/measure_pitch.py):
+              combo1 1918, combo2 2153, combo3 2416, combo4 2874, combo5 3226 Hz
+              (combo1 < .. < combo5, ascending).
 
-Original works, synthesized from scratch for m3te by the project. No sampled
-or third-party audio. Released into the public domain under CC0 1.0:
-https://creativecommons.org/publicdomain/zero/1.0/
+clear.wav   — "confirmation_001" from Kenney "Interface Sounds" (CC0)
+              https://kenney.nl/assets/interface-sounds
+              Not loaded by the shipped game; kept as a CC0 reference clip.
 
-Produced by the build-time tool tools/synth_audio.py (pure-Python stdlib
-additive synthesis: a glossy bell timbre — fundamental plus a few decaying
-partials and a detuned shimmer top, fast attack, exponential decay, onset
-pitch blip), then converted to the canonical iOS System-Sound format
-(WAVE / mono / 44100 Hz / signed-16-bit PCM) with afconvert. The shipped
-game never runs this tool; it only loads the finished WAVs.
+Processing
+----------
 
-All cues sit above clear.wav's ~784 Hz fundamental. Measured fundamentals
-(tools/measure_pitch.py): swap 1023, match 1319, combo1 1047, combo2 1175,
-combo3 1319, combo4 1568, combo5 1760 Hz (combo1<..<combo5, ascending);
-win is an ascending arpeggio C6-E6-G6-C7, lose a descending G6-E6-C6.
+Sources downloaded as the official Kenney CC0 .ogg packs and converted with
+ffmpeg (decode + mono + 44100 Hz + peak-normalize to -9 dBFS; combos additionally
+pitch-shifted), then re-wrapped to the canonical WAVE/LEI16 container with
+afconvert. The shipped game never runs any build tool; it only loads the
+finished WAVs. (tools/synth_audio.py is the now-unused historical synth tool
+that produced the previous bank.)