Create · Sound
Every sound on this page is code
An AI can't record a foley session — but it can write synthesis. Hayao's audio engine turns parameters into coins, lasers, and whole jazz records, deterministically, in the browser. Tap anything below: it's synthesised the moment you ask.
The SFX kit — tap one, read its whole source below
// tap a pad — the line that plays is the sound's entire sourceComposed music — synthesised live, looping until you stop it
No samples, ever
SFX are one-line SoundSpecs; music is notes, instruments and a mix — all parameters. Nothing to license, nothing to fetch, nothing your agent can't write.
Six voices, six jobs
Sine, triangle and noise in disciplined roles — the same soft-synthesis voice across SFX and music, so a game never sounds like two products.
Machine-audited mixes
The soundtrack ships with asserted spectral centroid and crest-factor budgets — the tests prove the music stays out of the SFX's way.
In your game
Your agent scores the game while it builds it
Because sound is data, audio lives in the same diff as the mechanic it serves — a coin's chime ships in the same commit as the coin. The full engine surface (voices, songs, buses, the ZzFX bridge) is in the audio doc.