# My World recorded audio

License checked on the original publisher pages, 2026-09-14. All selected recordings are CC0; no attribution is required, but the authors are credited here. Downloads are stored locally; runtime does not depend on a third-party audio host.

| Production files | Original / author | Source |
| --- | --- | --- |
| step-wood-0..2.mp3, step-concrete-0..2.mp3, step-carpet-0..2.mp3 | footstep_wood/concrete/carpet_000..002.ogg — Kenney | https://kenney.nl/assets/impact-sounds |
| door.mp3, book.mp3, switch.mp3, chair.mp3 | doorOpen_1, bookOpen, metalClick, creak1 — Kenney | https://kenney.nl/assets/rpg-audio |
| page-1.mp3, page-2.mp3 | book_flip.1/2.ogg — StarNinjas | https://opengameart.org/content/10-book-page-flips |
| bird.mp3 | birdchirping071414_0.mp3 — syncopika | https://opengameart.org/content/bird-chirping-sounds |
| wave.mp3 | wave_01_cc0-18363__jasinski__alkaibeach.flac — jasinski, excerpt uploaded by qubodup | https://opengameart.org/content/beach-ocean-waves |
| machine.mp3 | Calculator-printer #6, sound 3558 — Joseph SARDIN | https://bigsoundbank.com/calculatrice-imprimante-6-s3558.html |

CC0: https://creativecommons.org/publicdomain/zero/1.0/
StarNinjas profile: https://opengameart.org/users/starninjas

Adaptations: short effects converted to mono 32 kHz / 96 kbps MP3 for browser compatibility; printer excerpt capped at four seconds with a short fade-in/out; wave converted to the same delivery format. Bird recording retained as delivered. Volume is mixed in Web Audio. A short crossfade is applied to the wave buffer before looping. No synthesizer or oscillator-generated sound remains.

Playback: audio remains off until opted in. Buffers are cached once, maximum eight concurrent voices, footsteps vary across three recordings, environmental sea playback is restricted to Islands, bird cue follows the visible bird cycle. Paper/Night intentionally have no unrelated ambient drone. Machine audio follows the four-second paper-conveyor action. Sound is suspended when the tab loses focus.

Night ambience: `night-city.mp3`, Joseph SARDIN, Paris by Night #0680, CC0, source https://bigsoundbank.com/paris-la-nuit-s0680.html (license verified 2026-09-14). A 40-second mono 24 kHz/64 kbps excerpt, high-pass 90 Hz/low-pass 2200 Hz to suggest distant traffic, fade-in/out plus runtime loop crossfade. Plays only in Night while sound is enabled, after a user gesture; an explicit mute preference is remembered. Replaces the previous absence of Night ambience.