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

# Text to speech

Text-to-speech (TTS) models take written text and turn it into natural-sounding spoken audio. In SLNG voice agents this is the "Speak" step: the LLM sends back a response and the TTS model gives it a voice the caller hears. The voice's quality and speed shape how the whole agent feels. A natural voice builds trust, and a fast one keeps the conversation flowing without awkward pauses.

**TTS providers we support:**

* Deepgram
* Cartesia
* Fish Audio
* Inworld
* Sarvam AI
* KugelAudio
* Murf
* Soniox
* Gradium

Get started quick with [this guide](/guides/models/your-first-request).