CoSynth doesn't begin with presets.
It doesn't begin with samples.
It grows sound from living musical worlds.
Traditional synthesizers replay.
CoSynth explores.
Traditional synthesizers save sounds.
CoSynth saves places.
Traditional synthesizers begin with presets.
CoSynth begins with possibility.
You drift through it. You stop. You freeze a single moment. That moment becomes your tone — and its coordinates point back to that exact place in the river, forever.
The sound is an address, not a sample.
Each world is a generative composition that never repeats — woven from rules, not recordings. Beautiful to listen to on its own. Endless to forage from.
Struck-bronze gongs blooming through a lacquered hall.
A dusted tape loop of city rain at four in the morning.
Wordless voices folding into stone, sustained forever.
Sub-aquatic drum & bass — pressure rising under glass.
Wet leaves, distant birds, wood resonating in the dark.
Hammered steel and cooling pipes — a working machine room.
String drones and hand percussion crossing the dunes.
Polyrhythmic taps locking into a slow geometric pulse.
A CoSynth patch isn't audio. It's a coordinate — a tiny pointer back into a living engine that regenerates the exact sound on demand.
engine: templeseed: 0xA3F1·9Cat: 04:17.382blend: [.62, .18, .04, .16]loop: 0.42freeze: locked
A piano has 88 keys. A sampler holds what someone else recorded. A preset bank empties.
A CoSynth world has no last sound.
Every coordinate is discoverable. Every coordinate is reproducible. And no two journeys through it are ever the same.
Runs entirely in your browser. Mouse, touch, keys — even an Atari joystick. Red button freezes the moment.
Play CoSynth →We're opening the worlds to a small group of musicians and sound designers. Drop your email — we'll send an invite when it's your turn.