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

# Voice Settings

> Fine-tune supported voices with provider-specific parameters

export const Screenshot = ({lightSrc, darkSrc, alt, caption, maxWidth = "880px"}) => {
  return <div style={{
    margin: "1rem auto",
    maxWidth,
    width: "100%"
  }}>
      <Frame>
        <img className="block dark:hidden" src={lightSrc} alt={alt} />
        <img className="hidden dark:block" src={darkSrc} alt={alt} />
      </Frame>
      {caption ? <p style={{
    marginTop: "0.5rem",
    fontSize: "0.875rem",
    color: "inherit",
    opacity: 0.8
  }}>
          {caption}
        </p> : null}
    </div>;
};

## Voice Configuration Parameters

After [selecting your voice](/build/voice-speech/select-voice), you can adjust provider-specific settings to fine-tune how it sounds. The current dashboard exposes adjustable voice parameters for **ElevenLabs** voices. Azure Speech and Cartesia voices use their provider defaults in the itellicoAI interface.

<Note>
  Voice settings are displayed dynamically based on your selected voice. If your selected provider does not expose adjustable settings, choose a different voice or provider instead. Changes apply immediately to new conversations.
</Note>

***

## ElevenLabs Settings

ElevenLabs voices support the following adjustable parameters:

<Screenshot lightSrc="/images/voice-parameters__voice-params-light.png" darkSrc="/images/voice-parameters__voice-params-dark.png" alt="ElevenLabs Voice Parameters dialog showing Stability, Similarity Boost, Style, Use Speaker Boost, and Speed controls" />

### Stability

Controls consistency and expressiveness (range: 0.0-1.0, itellicoAI default: 0.71)

**How it works:**

* **Lower values (0.3-0.5):** More expressive and varied, but less consistent between generations
* **Medium values (0.5-0.7):** Balanced expressiveness and consistency (recommended)
* **Higher values (0.7-1.0):** More consistent and predictable, but may sound monotone

**Recommended starting point:** 0.5-0.7

Use lower stability for creative applications where variety is desired, and higher stability (0.6-0.85) for consistent customer service responses.

### Similarity Boost

Controls how closely the voice matches the original speaker (range: 0.0-1.0, itellicoAI default: 0.75)

**How it works:**

* **Lower values (0.5-0.7):** More creative interpretation of the voice
* **Medium values (0.75-0.8):** Balanced adherence to original voice (recommended)
* **Higher values (0.8-1.0):** Strict matching to original voice character

**Recommended starting point:** 0.75-0.8

Higher values increase processing demands and can add latency. They're also more likely to reproduce artifacts if the source voice data is noisy.

### Style

Controls stylistic variation in pacing and intonation (range: 0.0-1.0, itellicoAI default: 0.0)

**How it works:**

* **0.0:** Neutral delivery (recommended)
* **0.5-1.0:** Amplified style of the original speaker

**Recommended starting point:** 0.0

Higher style values can make voices less stable and add latency. Keep this at 0 for most use cases.

### Speaker Boost

Enhances clarity and presence (boolean, itellicoAI default: enabled)

**How it works:**

* **Enabled:** Boosts similarity to the original speaker, improving clarity
* **Disabled:** Standard processing

**Recommended starting point:** Enabled

Increases latency slightly; subtle effect.

### Speed

Controls playback speed (range: 0.7-1.2, itellicoAI default: 1.0)

**Speed values:**

* **0.7-0.9:** Slower, clearer delivery
* **1.0:** Normal speed (default)
* **1.1-1.2:** Faster, more energetic delivery

**Recommended starting point:** 1.0

Adjust in small increments (0.05-0.1) and test with full conversations.

***

## Other Voice Providers

Azure Speech and Cartesia voices do not currently expose adjustable voice-parameter controls in the itellicoAI dashboard. For these providers, focus on choosing the right voice, language, and provider during [voice selection](/build/voice-speech/select-voice).

<Note>
  Provider defaults are still optimized for real-time conversations. If you need a different speaking style, compare multiple voices from the same provider before switching providers.
</Note>

***

## Adjusting Settings

### How to Change Voice Settings

1. Navigate to **General** → **Speaking** in your agent editor
2. Your currently selected voice is displayed in the "Current Voice" card at the top
3. Click the **gear icon** next to your current voice (available for ElevenLabs voices)
4. A settings panel opens with adjustable parameters for your voice
5. Adjust sliders or toggles as needed
6. Click **Save Changes** to apply

***

## Common Settings by Use Case

<AccordionGroup>
  <Accordion title="Customer Support" icon="headset">
    **ElevenLabs:**

    * Stability: 0.60-0.85
    * Similarity: 0.75-0.85
    * Style: 0.0
    * Speed: 0.95-1.05

    **Goal:** Clear, steady, professional
  </Accordion>

  <Accordion title="Sales" icon="chart-line">
    **ElevenLabs:**

    * Stability: 0.45-0.70
    * Similarity: 0.70-0.80
    * Style: 0.0
    * Speed: 1.05-1.15

    **Goal:** Energetic, confident, engaging
  </Accordion>

  <Accordion title="Technical Support" icon="wrench">
    **ElevenLabs:**

    * Stability: 0.60-0.85
    * Similarity: 0.75-0.85
    * Style: 0.0
    * Speed: 0.95-1.0

    **Goal:** Clear, patient, instructional
  </Accordion>

  <Accordion title="Healthcare" icon="heart-pulse">
    **ElevenLabs:**

    * Stability: 0.70-0.85
    * Similarity: 0.80-0.90
    * Style: 0.0
    * Speed: 0.9-1.0

    **Goal:** Calm, consistent, professional
  </Accordion>
</AccordionGroup>

***

## Best Practices

**Start with recommended defaults:** Itellico defaults are optimized starting points. ElevenLabs recommends stability ≈0.5 and similarity ≈0.75-0.8 as common baselines.

**Make small changes:** Voice settings are sensitive. Adjust in small increments and test after each change.

**Test in context:** Use full conversation scenarios (3-5 minutes), not just single-sentence samples. You can also add [ambient sound](/build/voice-speech/ambient-sound) to create a more natural atmosphere.

**Consider your audience:** Older customers often prefer slightly slower speeds. Younger audiences may prefer slightly faster.

**Understand response time trade-offs:** Higher similarity boost and speaker boost increase latency. Style values >0 can also add latency and reduce stability.

**Document your settings:** Keep track of what works for each use case and voice combination.

***

## Next Steps

<CardGroup cols={2}>
  <Card title="Custom Pronunciations" icon="spell-check" href="/build/voice-speech/custom-pronunciations">
    Correct pronunciation of brand names and technical terms
  </Card>

  <Card title="Ambient Sound" icon="volume" href="/build/voice-speech/ambient-sound">
    Add background ambience to calls
  </Card>

  <Card title="Select Voice" icon="microphone" href="/build/voice-speech/select-voice">
    Choose a different voice
  </Card>

  <Card title="Test Your Agent" icon="vial" href="/test/web-simulator">
    Test your voice settings with web calls
  </Card>
</CardGroup>