Expressive Voice Narrator

View Cartesia Narrator Example on GitHub

Check out the complete Cartesia Narrator example in our GitHub repository

In this example, we build a storytelling narrator agent using Cartesia’s Sonic 3 TTS 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.

Vision Agents uses Stream Video for real-time WebRTC transport by default. External WebRTC transports are supported as well. Most AI providers offer free tiers to get started.

What You Will Build

Listen to story topics via voice input using Cartesia Ink STT
Generate creative narratives using OpenAI’s GPT-4o-mini
Speak with highly expressive and customizable voice using Cartesia’s Sonic 3 TTS
Use audio markup tags for enhanced speech control (emotions, pauses, emphasis)
Run on Stream’s low-latency edge network

Next Steps

Cartesia Integration

Explore Cartesia’s TTS configuration and audio markup

Live Video Try-On

Real-time virtual try-on with Decart’s Lucy-2 model

Live Video Try-On

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View Cartesia Narrator Example on GitHub

​What You Will Build

​Next Steps

Cartesia Integration

Live Video Try-On

What You Will Build

Next Steps