The voice you choose significantly affects how contacts perceive your AI agent. Atllas provides a library of pre-built voices and the ability to clone your own.
Voice Library
The voice library contains a curated set of voices powered by leading TTS providers (including ElevenLabs). Each voice has a name, gender, and sample you can play before selecting.
To choose a voice:
- Browse or search the library
- Click a voice to hear a preview
- Click Select to use it for your campaign
Voice Settings
Once a voice is selected, you can fine-tune its delivery:
| Setting | Description |
|---|
| Speech Rate | How fast the AI speaks. Default is 1.0. The available range depends on the selected voice’s provider — for ElevenLabs voices, the range is 0.7–1.2 |
| Stability | (ElevenLabs voices only, surfaced when Speech Rate is non-default) How consistent the voice sounds across sentences. Higher stability = more uniform; lower = more expressive variation |
| Similarity Boost | (ElevenLabs voices only, surfaced when Speech Rate is non-default) How closely the output matches the original voice sample. Higher values are more accurate but can introduce audio artifacts |
Voice Cloning
Voice cloning lets you create a custom voice from an audio recording — useful if you want the AI to sound like a specific person on your team.
Requirements
- At least 30 seconds of clean audio (no background noise, music, or echo)
- Supported formats: MP3, WAV, M4A
- The speaker should use a natural, conversational tone
Creating a Cloned Voice
- Go to Settings → Voices
- Click Create Voice Clone
- Upload your audio file and give the voice a name
- The clone is processed in a few minutes and then available in the voice library
Your account includes up to 2 custom voice slots. Deleting a voice clone frees the slot for a new one.
Language Support
Voices are available in multiple languages. When selecting a voice, filter by language to find options that match your target audience. If you select a non-English voice, the AI will respond in that language throughout the call.
Ensure your call script and call details are written in the same language as the voice you select. Mixed-language configurations may produce inconsistent results.
