Backyard Volley + Backyard Volley Classic ("Twilight Soak-Off") music and sound effects, served from /assets/siege-audio/
and used by public/audio/siege.js and public/audio/sling.js. Added 2026-10-14 by the Backyard Volley sound pass.
All files are CC0 1.0 (https://creativecommons.org/publicdomain/zero/1.0/).
Licences verified 2026-10-14: every Kenney pack page (https://kenney.nl/assets/<pack>) lists CC0 and each zip's License.txt
reads "Creative Commons Zero, CC0"; every OpenGameArt entry page's "License(s)" field reads CC0 (one entry is dual-listed
OGA-BY 3.0 / CC0 and is used under CC0, noted below). Files are copied unchanged (renamed only); nothing from the archives
was executed. The four .wav files marked "generated" were synthesised for this project by a small Node script (no samples).
Format: file | title / pack / original file | author | source URL | licence

music-main.ogg        | Carnival Rides / carnivalrides.ogg                          | Écrivain            | https://opengameart.org/content/carnival-rides | CC0 1.0
music-aim.ogg         | Short kalimba loop / Kalimba.ogg                            | extenz              | https://opengameart.org/content/short-kalimba-loop | CC0 1.0
music-final.ogg       | Ukulele Forest (Beginning, Loop and End) / forest_loop.ogg  | StarNinjas          | https://opengameart.org/content/ukulele-forest-beginning-loop-and-end | CC0 1.0
music-results.ogg     | Music Jingles / Audio/Pizzicato jingles/jingles_PIZZI07.ogg | Kenney (kenney.nl)  | https://kenney.nl/assets/music-jingles | CC0 1.0
sfx-crickets.mp3      | Crickets Ambient Noise - loopable / crickets_1.mp3          | Wolfgang_           | https://opengameart.org/content/crickets-ambient-noise-loopable | CC0 1.0
sfx-dog.wav           | Dog barking mono / dog_barking_mono.wav (recorded by Brandon Morris) | HaelDB     | https://opengameart.org/content/dog-barking-mono | CC0 1.0 (dual-listed OGA-BY 3.0 / CC0; used under CC0)
sfx-pop.ogg           | balloon sounds / balloon_pop_0.ogg                          | Gniffelbaf (submitted to OGA) | https://opengameart.org/content/balloon-sounds | CC0 1.0
sfx-boing-1.mp3       | Boings / bung_01.mp3                                        | EZduzziteh          | https://opengameart.org/content/boings | CC0 1.0
sfx-boing-2.mp3       | Boings / bing_01_0.mp3                                      | EZduzziteh          | https://opengameart.org/content/boings | CC0 1.0
sfx-splash-1.ogg      | 40 CC0 water / splash / slime SFX / splash_04.ogg           | rubberduck          | https://opengameart.org/content/40-cc0-water-splash-slime-sfx (https://opengameart.org/comment/82442) | CC0 1.0
sfx-splash-2.ogg      | 40 CC0 water / splash / slime SFX / splash_08.ogg           | rubberduck          | same | CC0 1.0
sfx-splash-3.ogg      | 40 CC0 water / splash / slime SFX / splash_10.ogg           | rubberduck          | same | CC0 1.0
sfx-splash-4.ogg      | 40 CC0 water / splash / slime SFX / splash_06.ogg           | rubberduck          | same | CC0 1.0
sfx-splat-1.ogg       | 40 CC0 water / splash / slime SFX / splash_09.ogg           | rubberduck          | same | CC0 1.0
sfx-splat-2.ogg       | 40 CC0 water / splash / slime SFX / splash_15.ogg           | rubberduck          | same | CC0 1.0
sfx-soak-1.ogg        | 40 CC0 water / splash / slime SFX / splash_07.ogg           | rubberduck          | same | CC0 1.0
sfx-soak-2.ogg        | 40 CC0 water / splash / slime SFX / splash_02.ogg           | rubberduck          | same | CC0 1.0
sfx-bubble.ogg        | 40 CC0 water / splash / slime SFX / bubble_02.ogg           | rubberduck          | same | CC0 1.0
sfx-bell.ogg          | Impact Sounds / Audio/impactBell_heavy_002.ogg              | Kenney (kenney.nl)  | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-ding.ogg          | Impact Sounds / Audio/impactBell_heavy_004.ogg              | Kenney (kenney.nl)  | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-golden.ogg        | Impact Sounds / Audio/impactBell_heavy_001.ogg              | Kenney (kenney.nl)  | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-ice-1.ogg         | Impact Sounds / Audio/impactGlass_heavy_000.ogg             | Kenney (kenney.nl)  | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-ice-2.ogg         | Impact Sounds / Audio/impactGlass_heavy_002.ogg             | Kenney (kenney.nl)  | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-thud.ogg          | Impact Sounds / Audio/impactSoft_heavy_001.ogg              | Kenney (kenney.nl)  | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-dart-1.ogg        | Impact Sounds / Audio/impactWood_light_000.ogg              | Kenney (kenney.nl)  | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-dart-2.ogg        | Impact Sounds / Audio/impactWood_light_002.ogg              | Kenney (kenney.nl)  | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-box-1.ogg         | Impact Sounds / Audio/impactPlank_medium_001.ogg            | Kenney (kenney.nl)  | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-box-2.ogg         | Impact Sounds / Audio/impactPlank_medium_003.ogg            | Kenney (kenney.nl)  | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-brick-1.ogg       | Impact Sounds / Audio/footstep_concrete_000.ogg             | Kenney (kenney.nl)  | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-brick-2.ogg       | Impact Sounds / Audio/footstep_concrete_003.ogg             | Kenney (kenney.nl)  | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-glass-1.ogg       | Impact Sounds / Audio/impactGlass_light_001.ogg             | Kenney (kenney.nl)  | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-glass-2.ogg       | Impact Sounds / Audio/impactGlass_light_003.ogg             | Kenney (kenney.nl)  | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-box-break-1.ogg   | Impact Sounds / Audio/impactPlank_medium_000.ogg            | Kenney (kenney.nl)  | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-box-break-2.ogg   | Impact Sounds / Audio/impactPlank_medium_002.ogg            | Kenney (kenney.nl)  | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-brick-break-1.ogg | Impact Sounds / Audio/impactMining_000.ogg                  | Kenney (kenney.nl)  | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-brick-break-2.ogg | Impact Sounds / Audio/impactMining_004.ogg                  | Kenney (kenney.nl)  | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-glass-break-1.ogg | Impact Sounds / Audio/impactGlass_heavy_001.ogg             | Kenney (kenney.nl)  | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-glass-break-2.ogg | Impact Sounds / Audio/impactGlass_heavy_004.ogg             | Kenney (kenney.nl)  | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-collapse.ogg      | Impact Sounds / Audio/impactWood_heavy_001.ogg              | Kenney (kenney.nl)  | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-bonk.ogg          | Impact Sounds / Audio/impactSoft_medium_001.ogg             | Kenney (kenney.nl)  | https://kenney.nl/assets/impact-sounds | CC0 1.0
sfx-coins.ogg         | RPG Audio / Audio/handleCoins.ogg                           | Kenney (kenney.nl)  | https://kenney.nl/assets/rpg-audio | CC0 1.0
sfx-coin.ogg          | RPG Audio / Audio/handleCoins2.ogg                          | Kenney (kenney.nl)  | https://kenney.nl/assets/rpg-audio | CC0 1.0
sfx-whoosh.ogg        | RPG Audio / Audio/cloth1.ogg                                | Kenney (kenney.nl)  | https://kenney.nl/assets/rpg-audio | CC0 1.0
sfx-hedge.ogg         | RPG Audio / Audio/cloth2.ogg                                | Kenney (kenney.nl)  | https://kenney.nl/assets/rpg-audio | CC0 1.0
sfx-umbrella.ogg      | RPG Audio / Audio/clothBelt.ogg                             | Kenney (kenney.nl)  | https://kenney.nl/assets/rpg-audio | CC0 1.0
sfx-nope.ogg          | Interface Sounds / Audio/error_005.ogg                      | Kenney (kenney.nl)  | https://kenney.nl/assets/interface-sounds | CC0 1.0
sfx-lock.ogg          | Interface Sounds / Audio/toggle_002.ogg                     | Kenney (kenney.nl)  | https://kenney.nl/assets/interface-sounds | CC0 1.0
sfx-unlock.ogg        | Interface Sounds / Audio/toggle_001.ogg                     | Kenney (kenney.nl)  | https://kenney.nl/assets/interface-sounds | CC0 1.0
sfx-tick.ogg          | Interface Sounds / Audio/tick_004.ogg                       | Kenney (kenney.nl)  | https://kenney.nl/assets/interface-sounds | CC0 1.0
sfx-select.ogg        | UI Audio / Audio/switch7.ogg                                | Kenney (kenney.nl)  | https://kenney.nl/assets/ui-audio | CC0 1.0
sfx-ko.ogg            | Music Jingles / Audio/Pizzicato jingles/jingles_PIZZI00.ogg | Kenney (kenney.nl)  | https://kenney.nl/assets/music-jingles | CC0 1.0
sfx-round-win.ogg     | Music Jingles / Audio/Pizzicato jingles/jingles_PIZZI03.ogg | Kenney (kenney.nl)  | https://kenney.nl/assets/music-jingles | CC0 1.0
sfx-round-draw.ogg    | Music Jingles / Audio/Pizzicato jingles/jingles_PIZZI13.ogg | Kenney (kenney.nl)  | https://kenney.nl/assets/music-jingles | CC0 1.0
sfx-shop-close.ogg    | Music Jingles / Audio/Pizzicato jingles/jingles_PIZZI04.ogg | Kenney (kenney.nl)  | https://kenney.nl/assets/music-jingles | CC0 1.0
sfx-wind-read.ogg     | Music Jingles / Audio/Pizzicato jingles/jingles_PIZZI16.ogg | Kenney (kenney.nl)  | https://kenney.nl/assets/music-jingles | CC0 1.0
sfx-weak.ogg          | Music Jingles / Audio/Hit jingles/jingles_HIT03.ogg         | Kenney (kenney.nl)  | https://kenney.nl/assets/music-jingles | CC0 1.0
sfx-vo-round.ogg      | Voiceover Pack / Male/round.ogg                             | Kenney (kenney.nl)  | https://kenney.nl/assets/voiceover-pack | CC0 1.0
sfx-vo-final.ogg      | Voiceover Pack / Male/final_round.ogg                       | Kenney (kenney.nl)  | https://kenney.nl/assets/voiceover-pack | CC0 1.0
sfx-vo-go.ogg         | Voiceover Pack / Male/war_go_go_go.ogg                      | Kenney (kenney.nl)  | https://kenney.nl/assets/voiceover-pack | CC0 1.0
sfx-vo-hurry.ogg      | Voiceover Pack / Male/hurry_up.ogg                          | Kenney (kenney.nl)  | https://kenney.nl/assets/voiceover-pack | CC0 1.0
sfx-vo-congrats.ogg   | Voiceover Pack / Male/congratulations.ogg                   | Kenney (kenney.nl)  | https://kenney.nl/assets/voiceover-pack | CC0 1.0
sfx-sling.wav         | generated: rubber-band slingshot twang (noise slap + pitch-dropping body)   | Tap Tavern | - | CC0 1.0 (dedicated by the project)
sfx-whistle.wav       | generated: falling whistle for the Balloon Drop (sine glide 1500 -> 650 Hz) | Tap Tavern | - | CC0 1.0 (dedicated by the project)
sfx-tape.wav          | generated: tape roll ripping (stuttering band-passed noise)                 | Tap Tavern | - | CC0 1.0 (dedicated by the project)
sfx-wind.wav          | generated: wind gust over the lawn (swelling band-passed noise)             | Tap Tavern | - | CC0 1.0 (dedicated by the project)

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.