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

# Voice Configuration

> Configure voice speed, volume, emotion, and provider-specific settings

You can configure how your persona's voice sounds — speed, volume, and emotion — via `voiceGenerationOptions` in the persona config. The available options depend on the provider and model of the configured voice.

```javascript theme={"system"}
const personaConfig = {
  name: "Cara",
  avatarId: "30fa96d0-26c4-4e55-94a0-517025942e18",
  voiceId: "6bfbe25a-979d-40f3-a92b-5394170af54b",
  llmId: "a7cf662c-2ace-4de1-a21e-ef0fbf144bb7",
  systemPrompt: "You are Cara, a helpful customer service representative.",
  voiceGenerationOptions: {
    speed: 1.2,
    volume: 0.8,
    emotion: "content"
  }
};
```

These settings can be set when creating or updating a persona, as well as when generating a session token. See the [API Reference](/api-reference/personas/create-persona) for details.

## Cartesia voices

The following options are valid for Cartesia `sonic-3` voices:

| Option    | Range     | Description                                                              |
| --------- | --------- | ------------------------------------------------------------------------ |
| `volume`  | 0.5 – 2.0 | Multiplier to decrease or increase the volume of the original voice      |
| `speed`   | 0.6 – 1.5 | Multiplier to decrease or increase the speed of the original voice       |
| `emotion` | string    | Emotion to apply: `neutral`, `calm`, `angry`, `content`, `sad`, `scared` |

## ElevenLabs voices

The following options are valid for ElevenLabs `v1` and `v2` voices:

| Option            | Range     | Description                                                                                    |
| ----------------- | --------- | ---------------------------------------------------------------------------------------------- |
| `stability`       | 0 – 1     | How much the voice varies between generations. Lower values introduce more emotional variation |
| `similarityBoost` | 0 – 1     | How closely the generated voice matches the original reference audio                           |
| `speed`           | 0.7 – 1.2 | Multiplier to decrease or increase the speed of the original voice                             |

For `v2` voices, these additional options are also available:

| Option            | Type    | Description                                                                                  |
| ----------------- | ------- | -------------------------------------------------------------------------------------------- |
| `useSpeakerBoost` | boolean | Boost similarity to the original speaker. May increase latency                               |
| `style`           | 0 – 1   | How much the original speaker's style is amplified. Values other than 0 may increase latency |

## Changing voices

The `voiceGenerationOptions` are specific to the provider, model, and voice being used. When you change the `voiceId` for a persona, these options reset. Use the copy persona feature in Lab when experimenting with different voices to avoid losing your existing config.