> ## Documentation Index
> Fetch the complete documentation index at: https://docs.responsivevoice.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Extended Usage Example

A full-featured example showing voice selection, playback controls, speech parameter tuning, and a live event log.

> [!TIP]
> [Live demo](https://examples.responsivevoice.org/browser/extended/) · [Source code](https://github.com/responsivevoice/examples/tree/main/browser/extended)

## What it covers

- Voice browser with language filtering
- `speak` / `pause` / `resume` / `cancel` controls
- Rate / pitch / volume sliders
- Platform detection (browser, OS, device type)
- Real-time event log
- Demo mode indicator driven by `rv.isDemoMode()`
- Force-fallback toggle (use HTTP audio instead of Web Speech API)

## Speech parameter ranges

| Parameter | Min | Default | Max | Description  |
| --------- | --- | ------- | --- | ------------ |
| `rate`    | 0.1 | 1.0     | 2.0 | Speech speed |
| `pitch`   | 0.1 | 1.0     | 2.0 | Voice pitch  |
| `volume`  | 0.0 | 1.0     | 1.0 | Audio volume |

```js
rv.speak('Hello!', 'UK English Female', {
  rate: 1.2,
  pitch: 1.0,
  volume: 0.8,
});
```

## Force fallback mode

Bypass the Web Speech API and always use HTTP audio from the server:

```js
await rv.init({ apiKey: 'your-api-key', forceFallback: true });
```

Useful when you need consistent audio across browsers, or when Web Speech API voices are unavailable on the target device.

## Next Steps

- [Basic Example](/examples/basic) — the minimal starting point
- [Voice Selection Guide](/guides/voice-selection) — advanced voice filtering
- [Events Guide](/guides/events) — full event reference