---
title: Redux
description: "A redux as a device you can plug in: a number of bits, a downsample factor and a mix as a state, a panel that draws the stairs the bits make, a Web Audio engine with a sample-hold worklet and the tools an agent drives it with."
component: true
base: base
---

<ComponentPreview styleName="base-nova" name="block-redux" />

Roughens the sound like an early sampler: it keeps only some bits of each sample and holds each sample for several. The panel draws the stairs the bits make against the straight line of a clean sound; at 8 bits they are too fine to see, take it down to 3 or 4. It is a device like the [compressor](/docs/components/compressor): a state, a panel that draws it, an engine that plays it and tools an agent calls, each its own file.

## Installation

<CodeTabs>

<TabsList>
  <TabsTrigger value="cli">CLI</TabsTrigger>
  <TabsTrigger value="manual">Manual</TabsTrigger>
</TabsList>

<TabsContent value="cli">

```bash component
npx shadcn@latest add @audio-ui/block-redux
```

</TabsContent>

<TabsContent value="manual">

<Steps>

<Step>Install the packages:</Step>

```bash
npm install @audio-ui/react @audio-ui/core
```

<Step>Add the pieces you want. All of them, or only the state and the panel if your engine is elsewhere:</Step>

```bash
npx shadcn@latest add @audio-ui/redux-device @audio-ui/redux-panel @audio-ui/redux-engine
```

<Step>Copy and paste the demo that wires them, if you want it.</Step>

<ComponentSource
  styleName="base-nova"
  name="block-redux"
  title="components/examples/block-redux.tsx"
/>

</Steps>

</TabsContent>

</CodeTabs>

## Usage

```tsx
import { ReduxPanel } from "@/components/audio-ui/devices/redux/panel";
import { reduxDevice } from "@/components/audio-ui/devices/redux/device";

const [state, setState] = useState(() => reduxDevice.defaults());

<ReduxPanel onValueChange={setState} value={state} />;
```

The state is a plain object keyed by parameter id, so a host stores it, saves it with its project and sends it where it likes. `quantize(input, bits)` is one step of the quantizer and `REDUX_WORKLET` the source of the worklet.

## The engine

```ts
import { createReduxEngine } from "@/components/audio-ui/devices/redux/engine";

const engine = createReduxEngine(ctx, state);
source.connect(engine.input);
engine.output.connect(ctx.destination);
engine.update(nextState); // parameters ramp: no click
engine.dispose();
```

The bits are a quantizer table in a `WaveShaperNode`, rebuilt only when they change. The sample hold is an `AudioWorklet` loaded from a blob, so there is no file to serve: until it is ready the bits are already crushed and the rate is not yet reduced, and `engine.ready` resolves to `false` in a context that cannot run worklets. The hold takes whole samples, not a filtered resampling, so it aliases, which is the sound.

## The tools

```ts
import { deviceTools } from "@audio-ui/core/device";
import { reduxDevice } from "@/components/audio-ui/devices/redux/device";

const [set, reset] = deviceTools(reduxDevice);
```

`set` and `reset` change the state, with the ranges the device enforces: a value out of range is brought in and reported, a wrong one is refused by name, and a call never throws.

## Accessibility

Every control is a native input: the knobs are sliders named after their parameter, with the value and unit as the text value, the switches are toggle buttons, and everything takes the keyboard.