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On the recordRead 12 Oct 202617 facts
BELLOWS
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BELLOWS
Free
Free, open source audio engine
Read 12 Oct 2026 · bellows.live
On the record
- Audio engine
- The library uses an AudioWorklet kernel that schedules events on the audio thread for sample-accurate timing.github.com · read 12 Oct 2026
- Browser requirements
- AudioWorklet is required; the repository lists Chrome 66+, Firefox 76+, and Safari 14.1+ as supported, while Web MIDI is limited to Chromium and Firefox.github.com · read 12 Oct 2026
- Built-in instruments
- The site says BELLOWS includes 18 built-in synthesizers and supports playing with a mouse, keyboard, or MIDI controller.bellows.live · read 12 Oct 2026
- Commercial use
- Yesbellows.live · read 22 Sep 2026
- Formats and MIDI
- The library supports WAV encoding and decoding, standard MIDI file read and write, Web MIDI where available, and WebCodecs Opus export where available.github.com · read 12 Oct 2026
- Generative music
- A seed word can generate beats, basslines, melodies, and chords, with the same seed producing the same song each time.bellows.live · read 12 Oct 2026
- Import sounds
- Users can load SoundFont files or their own audio samples and play them across a keyboard.bellows.live · read 12 Oct 2026
- License
- The project is released under the Apache-2.0 license.bellows.live · read 12 Oct 2026
- Maker
- The site identifies Moheeb Zara (@virgilvox), hack.build, as the maker.bellows.live · read 12 Oct 2026
- Music theory
- The library supports more than 30 scales, chord parsing, voice leading, negative harmony, and tunings including EDO and just intonation.github.com · read 12 Oct 2026
- Offline rendering
- The engine can run in Node without a browser to render songs to WAV files.bellows.live · read 12 Oct 2026
- Product
- BELLOWS is a free, open source audio engine and interactive browser instrument and workbench.bellows.live · read 12 Oct 2026
- Recording
- The browser workbench can record music to a WAV file, and the site says it requires no account or upload.bellows.live · read 12 Oct 2026
- Sound tools
- The engine includes synthesizers, drum machines, samplers, soundfont support, sequencing, and effects.bellows.live · read 12 Oct 2026
- Use in projects
- The library can be installed with npm, loaded from unpkg or jsDelivr, or imported into apps built with Vite or webpack.bellows.live · read 12 Oct 2026
