Bumper Circuit ("Scrapyard Smash") audio, used by public/audio/derby.js. Art credits live in public/assets/derby/CREDITS.txt.
All files are CC0 1.0 (added 2026-10-14 by the Bumper Circuit sound pass).
Licences verified 2026-10-14: each Kenney zip contains a License.txt stating "Creative Commons Zero, CC0" and the
pack pages link CC0; each OpenGameArt page's License field reads CC0. Files are copied unchanged (renamed only).
Format: file | title / pack / original file | author | source URL | licence

music-main.ogg | "Metal Song - Energetic" / ente_evil.ogg | The Real Monoton Artist (submitted by TinyWorlds) | https://opengameart.org/content/metal-song-energetic | CC0 1.0
music-results.ogg | "Racing Game Finish & Jingle" / Race Finish Best (Jingle).ogg | MintoDog | https://opengameart.org/content/racing-game-finish-jingle | CC0 1.0
sfx-crowd.ogg | "Crowd Shouting/Speaking Ambience" / crowd_shouting_0.ogg | StarNinjas | https://opengameart.org/content/crowd-shoutingspeaking-ambience | CC0 1.0
sfx-cheer.ogg | "Cheers" / cheers_1.ogg | Nocturnal_Vanguard (AuraVoice) | https://opengameart.org/content/cheers-0 | CC0 1.0
sfx-ram1.ogg | Impact Sounds / Audio/impactPlate_heavy_000.ogg | Kenney (kenney.nl) | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-ram2.ogg | Impact Sounds / Audio/impactPlate_heavy_002.ogg | Kenney (kenney.nl) | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-ram3.ogg | Impact Sounds / Audio/impactPlate_heavy_004.ogg | Kenney (kenney.nl) | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-bump1.ogg | Impact Sounds / Audio/impactMetal_medium_000.ogg | Kenney (kenney.nl) | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-bump2.ogg | Impact Sounds / Audio/impactMetal_medium_002.ogg | Kenney (kenney.nl) | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-barrel1.ogg | Impact Sounds / Audio/impactMetal_heavy_000.ogg | Kenney (kenney.nl) | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-barrel2.ogg | Impact Sounds / Audio/impactMetal_heavy_001.ogg | Kenney (kenney.nl) | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-barrel3.ogg | Impact Sounds / Audio/impactMetal_heavy_003.ogg | Kenney (kenney.nl) | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-repair1.ogg | Impact Sounds / Audio/impactMining_000.ogg | Kenney (kenney.nl) | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-repair2.ogg | Impact Sounds / Audio/impactMining_002.ogg | Kenney (kenney.nl) | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-oil.ogg | Sci-Fi Sounds / Audio/slime_000.ogg | Kenney (kenney.nl) | https://kenney.nl/assets/sci-fi-sounds | CC0 1.0
sfx-wreck1.ogg | Sci-Fi Sounds / Audio/explosionCrunch_001.ogg | Kenney (kenney.nl) | https://kenney.nl/assets/sci-fi-sounds | CC0 1.0
sfx-wreck2.ogg | Sci-Fi Sounds / Audio/explosionCrunch_002.ogg | Kenney (kenney.nl) | https://kenney.nl/assets/sci-fi-sounds | CC0 1.0
sfx-shield.ogg | Sci-Fi Sounds / Audio/forceField_000.ogg | Kenney (kenney.nl) | https://kenney.nl/assets/sci-fi-sounds | CC0 1.0
sfx-energy.ogg | Interface Sounds / Audio/maximize_006.ogg | Kenney (kenney.nl) | https://kenney.nl/assets/interface-sounds | CC0 1.0
sfx-vo-3.ogg | Voiceover Pack / Male/3.ogg (voice: Jeffrey M. Smith) | Kenney (kenney.nl) | https://kenney.nl/assets/voiceover-pack | CC0 1.0
sfx-vo-2.ogg | Voiceover Pack / Male/2.ogg (voice: Jeffrey M. Smith) | Kenney (kenney.nl) | https://kenney.nl/assets/voiceover-pack | CC0 1.0
sfx-vo-1.ogg | Voiceover Pack / Male/1.ogg (voice: Jeffrey M. Smith) | Kenney (kenney.nl) | https://kenney.nl/assets/voiceover-pack | CC0 1.0
sfx-vo-go.ogg | Voiceover Pack / Male/go.ogg (voice: Jeffrey M. Smith) | Kenney (kenney.nl) | https://kenney.nl/assets/voiceover-pack | CC0 1.0
sfx-vo-hurry.ogg | Voiceover Pack / Male/hurry_up.ogg (voice: Jeffrey M. Smith) | Kenney (kenney.nl) | https://kenney.nl/assets/voiceover-pack | CC0 1.0
sfx-vo-timeover.ogg | Voiceover Pack / Male/time_over.ogg (voice: Jeffrey M. Smith) | Kenney (kenney.nl) | https://kenney.nl/assets/voiceover-pack | CC0 1.0
Procedurally generated for Tap Tavern (no fitting CC0 original found), synthesized by a small Node script; dedicated CC0:
sfx-horn.wav (air horn), sfx-boost.wav (engine rev), sfx-grid.wav (grid engine idle/revs), sfx-skid.wav (tyre squeal),
sfx-pit.wav (air impact wrench), sfx-rumble.wav (rumble-strip buzz), sfx-lights.wav (floodlight relay clunk + hum),
sfx-beep.wav (scoreboard beep) | Tap Tavern | generated | CC0 1.0

2026-10-17 mix pass: music files remastered with constant gain to target -20 LUFS, limited by -3 dB true-peak headroom. Original timing and loop points retained. Sources and licences above are unchanged.

music-final-lap.ogg | "Metal Song - Energetic" / ente_evil.ogg | The Real Monoton Artist (submitted by TinyWorlds) | https://opengameart.org/content/metal-song-energetic | CC0 1.0 | Adaptation: pitch-preserving 1.08x tempo, gentle bass lift, level matched; final-lap arrangement. Source licence rechecked 2026-10-17.