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Why Voice Matters

The voice is your agent’s first impression. Research consistently shows:
  • Users form an opinion about an AI agent within seconds
  • The wrong voice makes even a well-configured agent feel unprofessional
  • The right voice builds trust instantly

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TTS Providers at a Glance

Short answer: Start with Cartesia. If you need a premium, highly realistic voice, use ElevenLabs.

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Cartesia Voices

Cartesia is the most popular choice among TalkifAI users — lowest latency with a natural, clear sound.
Visit cartesia.ai/voices to preview voices live in the browser. Copy the Voice ID from there and paste it into your agent settings.

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OpenAI TTS Voices

Simple, consistent, and natural — OpenAI’s built-in voices require no external account.

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ElevenLabs Voices

ElevenLabs delivers the highest quality — the most human-like voices available. The tradeoff is slightly higher latency and cost.

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When to Use ElevenLabs

  • You need a premium brand image
  • Emotional range matters (sympathy, enthusiasm, warmth)
  • Realism is more important than speed
  • You can tolerate an extra 100–200ms of latency
Find your Voice ID in the ElevenLabs dashboard under Voice Library. Paste it into the Voice ID field in your agent settings.

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Choose by Use Case

Recommended: Cartesia Sonic or OpenAI novaWhy: Warm, approachable, and clearly articulated. Soothing when customers are frustrated.Settings:
  • Speed: 1.0x (default)
Recommended: Cartesia Barbadian Man or ElevenLabs JoshWhy: Energetic and engaging — holds attention. Lower disconnect rates on cold calls.Settings:
  • Speed: 1.05x — slightly faster projects confidence
Recommended: OpenAI shimmer or a calm Cartesia female voiceWhy: Calm, reassuring tone. Patients are often anxious — a soothing voice genuinely helps.Settings:
  • Speed: 0.95x — slightly slower for clarity
Recommended: Cartesia Australian Man or OpenAI echoWhy: Casual and modern — matches a startup’s brand voice without being too formal.Settings:
  • Speed: 1.0x

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Voice Settings

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Speed (0.5x – 2.0x)

Avoid going above 1.3x — the agent sounds robotic and users disconnect.

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Stability (ElevenLabs Only)

  • High (0.8+): Consistent, less expressive — good for formal contexts
  • Low (0.3–0.5): More expressive, natural variation — good for emotional conversations

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Style (ElevenLabs Only)

  • 0.0 = Neutral
  • 0.5 = Moderate expression
  • 1.0 = Maximum style and emotion

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How to Test Your Voice

After saving the agent:
  1. Go to Studio → Agent → Test
  2. Speak a few sentences and listen carefully
  3. Check:
    • Is pronunciation correct?
    • Does the speed feel natural?
    • Does the tone match the use case?
  4. Adjust → save → test again
Test these sentences:

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Next Steps

Create Your Agent

Voice selected — go complete your agent setup.

Test Your Agent

Test the voice properly before going live.