QA: "the sfx is too loud and scratchy." Drop-in asset swap — no engine change.
Replace the 9 synthesized cues (swap, match, combo1..combo5, win, lose) with
real free-licensed (CC0 1.0) sound effects from Kenney's Interface Sounds /
Digital Audio packs:
swap <- pluck_002 match <- confirmation_002
win <- powerUp7 lose <- minimize_006
combo1..5 <- glass_001 pitch-laddered up a pentatonic run (0,+2,+4,+7,+9 st)
via resample DSP -> ascending fundamentals 1918..3226 Hz.
Every cue: mono / 44100 Hz / Int16 PCM, <=0.54 s. Whole bank peak-normalized to
-9 dBFS, so peak AND RMS are well below the old synth (old peak -0.7..-2.9 dB,
mean -5.8..-9.3 dB; new peak -9.0 dB, mean -22..-30 dB). Audibly cleaner — no
synth harmonics.
LICENSE.txt rewritten with real per-file provenance (source URL + CC0). clear.wav
(already a CC0 Kenney clip, not loaded by the engine) left unchanged. Engine
(audio.sx/board_view.sx/main.sx) untouched; sim build loads all 9 cues, zero
"load failed".
Produce the first deliverable of the Candy-Crush vibe pass: a bank of bright,
glossy, higher-pitched SFX WAVs under assets/audio/, all in the exact canonical
iOS System-Sound format clear.wav uses (mono, 44100 Hz, signed-16-bit PCM).
Bank: swap, match, combo1..combo5 (ascending pentatonic run C6 D6 E6 G6 A6),
win (ascending arpeggio), lose (descending stinger). Every cue sits above
clear.wav's ~784 Hz fundamental; combo1<..<combo5 step strictly upward
(1047<1175<1319<1568<1760 Hz). Each loads via AudioServicesCreateSystemSoundID
with status 0.
Synthesized by the build-time tools/synth_audio.py (pure-Python additive
synthesis; the app never runs it) and converted with afconvert. Pitch verified
with tools/measure_pitch.py. Provenance (CC0) recorded in LICENSE.txt. No sx
code changes — engine wiring is P10.2/P10.3.
Feasibility spike outcome: iOS audio from sx is feasible with no sx-library
change. System Sound Services is plain C, reached with the same `#foreign`
FFI uikit.sx already uses (UIApplicationMain / dlsym / CACurrentMediaTime);
AudioToolbox + CoreFoundation are linked per-target in build.sx.
Smallest viable SFX: one short CC0 clip (Kenney Interface Sounds, CC0 1.0)
played when a swap clears a match. Purely additive — audio.sx reads/writes
no score/board/move state; the wiring in board_view only adds a call.
- audio.sx: load clear.wav once, AudioServicesPlaySystemSound on clear
- board_view.sx: trigger sfx_clear() on a legal swap that clears (>=1 round)
- main.sx: allocate + init g_audio at boot
- build.sx: link AudioToolbox + CoreFoundation on iOS
- assets/audio/clear.wav (+ one-line CC0 credit in LICENSE.txt)
Verified: ios-sim build links; 18/18 tests pass; sim boot log shows
"[sx] audio: clear cue loaded" (AudioServicesCreateSystemSoundID succeeded,
asset shipped in the bundle and decoded).
