Overview

What makes the sound behind the components: the hooks and libraries audio/ui ships on the Web Audio API, and how an engine of your own drives the same components.

The components draw and take input; they never make a sound. Something else plays: the hooks and libraries on these pages, which run on the browser's Web Audio API, or an engine of your own, such as one in an AudioWorklet or in WebAssembly.

Output: The page's one audio context, and a master bus with a limiter that every sound goes through.
Clock and time: A transport clock that schedules notes ahead on the audio clock, and the musical time it counts in.
Synthesis: Synth voices shaped by an envelope, and drum hits.
Input: A MIDI keyboard and the microphone.
Analysis: Live levels and spectra for meters and plots.

Each installs on its own with npx shadcn@latest add @audio-ui/<name>, to hooks/ or lib/, and the components that need one name it on their page.

Your own engine

Every component takes its state as values and reports changes through callbacks, so an engine of your own drives it the same way the hooks do:

Values that change on a gesture, such as a gain, a clip or a note, are props: value and onValueChange, and onValueCommitted when the gesture ends.
Values that change every frame, such as a playhead, a level or a spectrum, are live sources. A component reads one through its source prop and repaints without a React render.

createSource makes a source you push to from anywhere: an audio callback, a worker, a message from an AudioWorklet.

import { createSource } from "@audio-ui/react";

// Made once, outside a render.
const position = createSource(0);

// Wherever your engine reports where it is, such as each animation frame:
engine.onPosition((seconds) => position.set(seconds));

<Transport source={position} tempo={tempo} playing={playing} onPlayPause={toggle} />;
<Timeline duration={duration} source={position}>{/* … */}</Timeline>;

A source is { getSnapshot, subscribe }, the shape useSyncExternalStore reads, so any store that has those two works too. The hooks on these pages return sources in the same shape, which is why a component cannot tell them from yours.

Without React, @audio-ui/core holds the same logic as plain functions: the scheduler and the musical time in @audio-ui/core/time, the analysis in @audio-ui/core/analysis, MIDI in @audio-ui/core/midi and pitch in @audio-ui/core/pitch.

Wave shaper Output

Built by Ouest Labs, the source code is available on GitHub.

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