🔊 Sound Effects Board

60 of these 64 sounds are real recordings or professionally produced audio files (not code-generated tones) from free/open sources. Most are CC0 (public domain, no credit required), and a few need a byline per their license — here it is:

• Frog Ribbit — "tree frog.wav" by reinsamba (freesound.org), CC BY 3.0
• Chicken Cluck — "20070218.el.lobo.hens.wav" by dobroide (freesound.org), CC BY 3.0
• Xylophone Run, Harp Glissando, Trumpet Blast — MusyngKite SoundFont via gleitz/midi-js-soundfonts, CC BY-SA 3.0
• Maraca Shake — GeneralUser GS SoundFont by S. Christian Collins (schristiancollins.com)
• Sad Trombone — the "trombone" npm package by bchociej, Apache License 2.0
• Level Up, Victory Fanfare, Wrong Buzzer, Coin Collect, Power Up — uisfx by romainsimon, MIT License
• Game Over, Jump, Laser Zap, UFO Hover, Alien Chirp — Kenney.nl game-audio packs, CC0
• Everything else — CC0 recordings via the ESC-50/Freesound dataset, the Sonic Pi sample set, the Warfork open-source project, and other CC0 sound packs

Four sounds (Hiccup, Duck Quack, Owl Hoot, Cheer Whistle) couldn't be tracked down as real recordings we could clearly verify the license for, so those four still play a synthesized tone.