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

# Expressive Voice Narrator

> Build a storytelling agent with expressive speech using Cartesia's Sonic 3 TTS

<iframe className="w-full aspect-video rounded-xl" src="https://www.youtube.com/embed/KmirmVl-G3k" title="Expressive Narrator with Cartesia Sonic 3" frameBorder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowFullScreen />

<Card title="View Cartesia Narrator Example on GitHub" icon="github" href="https://github.com/GetStream/Vision-Agents/tree/main/plugins/cartesia/example">
  Check out the complete Cartesia Narrator example in our GitHub repository
</Card>

In this example, we build a storytelling narrator agent using [Cartesia's Sonic 3 TTS](https://cartesia.ai/?utm_medium=partner\&utm_source=getstream) with Vision Agents. The agent narrates stories with highly expressive speech, leveraging Cartesia's audio markup tags to customize the output with emotions, pauses, and vocal effects.

<Info>
  Vision Agents requires a [Stream](https://getstream.io/try-for-free/) account
  for real-time transport. Most providers offer free tiers to get started.
</Info>

## What You Will Build

* Listen to story topics via voice input using [Deepgram](https://deepgram.com/)
* Generate creative narratives using [OpenAI's GPT-4o-mini](https://openai.com/)
* Speak with highly expressive and customizable voice using [Cartesia's Sonic 3 TTS](https://cartesia.ai/?utm_medium=partner\&utm_source=getstream)
* Use audio markup tags for enhanced speech control (emotions, pauses, emphasis)
* Run on [Stream's](https://getstream.io/) low-latency edge network

## Next Steps

<CardGroup cols={2}>
  <Card title="Cartesia Integration" icon="plug" href="/integrations/tts/cartesia">
    Explore Cartesia's TTS configuration and audio markup
  </Card>

  <Card title="Live Video Try-On" icon="wand-magic-sparkles" href="/examples/visual-storyteller">
    Real-time virtual try-on with Decart's Lucy-2 model
  </Card>
</CardGroup>