Voice Settings

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Overview

After selecting your voice, you can adjust provider-specific settings to fine-tune how it sounds. Available settings depend on which voice provider you’ve selected.

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ElevenLabs Settings

ElevenLabs voices support the following adjustable parameters:

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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.

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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 computational load and can add latency. They’re also more likely to reproduce artifacts if the source voice data is noisy.

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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.

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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.

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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.

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Cartesia Settings

Cartesia voices support the following adjustable parameter:

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Speech Rate

Controls how fast the voice speaks (range: 0.5-2.0, default: 1.0) Speech rate values:

• 0.5-0.8: Slower delivery for clarity
• 1.0: Normal speed (default)
• 1.2-2.0: Faster delivery for efficiency

Recommended starting point: 1.0 Cartesia’s ultra-low latency makes speed adjustments feel responsive. Test with realistic conversation scenarios.

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Azure Speech Settings

Azure Speech voices do not support adjustable settings through the itellicoAI interface. Azure uses default voice configurations optimized by Microsoft for each neural voice.

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Adjusting Settings

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How to Change Voice Settings

1. Navigate to Voice tab in your agent configuration
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 and Cartesia voices)
4. A modal opens with adjustable parameters for your voice
5. Adjust sliders or toggles as needed
6. Click Save Changes to apply

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Common Settings by Use Case

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

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Next Steps