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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.
Voice settings are displayed dynamically based on your selected voice. Changes apply immediately to new conversations.

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ElevenLabs Settings

ElevenLabs voices support the following adjustable parameters:
ElevenLabs Voice Parameters dialog showing Stability slider with default 0.7 controlling voice stability and repetitiveness, Similarity Boost slider at 0.7 for increasing similarity to original voice, Style slider at 0.00 for speaking style intensity, Use Speaker Boost toggle enabled for clarity, Speed slider at 1.00 for playback speed multiplier, Streaming Latency dropdown set to 3, and Reset All, Cancel, Save Changes buttons
ElevenLabs Voice Parameters dialog showing Stability slider with default 0.7 controlling voice stability and repetitiveness, Similarity Boost slider at 0.7 for increasing similarity to original voice, Style slider at 0.00 for speaking style intensity, Use Speaker Boost toggle enabled for clarity, Speed slider at 1.00 for playback speed multiplier, Streaming Latency dropdown set to 3, and Reset All, Cancel, Save Changes buttons

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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

ElevenLabs:
  • Stability: 0.60-0.85
  • Similarity: 0.75-0.85
  • Style: 0.0
  • Speed: 0.95-1.05
Cartesia:
  • Speech Rate: 1.0
Goal: Clear, steady, professional
ElevenLabs:
  • Stability: 0.45-0.70
  • Similarity: 0.70-0.80
  • Style: 0.0
  • Speed: 1.05-1.15
Cartesia:
  • Speech Rate: 1.1-1.2
Goal: Energetic, confident, engaging
ElevenLabs:
  • Stability: 0.60-0.85
  • Similarity: 0.75-0.85
  • Style: 0.0
  • Speed: 0.95-1.0
Cartesia:
  • Speech Rate: 0.9-0.95
Goal: Clear, patient, instructional
ElevenLabs:
  • Stability: 0.70-0.85
  • Similarity: 0.80-0.90
  • Style: 0.0
  • Speed: 0.9-1.0
Cartesia:
  • Speech Rate: 0.9
Goal: Calm, consistent, professional

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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

Custom Pronunciations

Correct pronunciation of brand names and technical terms

Ambient Sound

Add background ambience to calls

Select Voice

Choose a different voice

Test Your Agent

Test your voice settings with web calls