Skip to main content

Day 19: Switching EchoKit’s TTS Provider to Fish.audio| The First 30 Days with EchoKit

· 2 min read

Over the past few days, we’ve been iterating on different parts of EchoKit’s voice pipeline — ASR, LLMs, system prompts, and TTS (including ElevenLabs and Groq).

On Day 19, we switch EchoKit’s Text-to-Speech provider to Fish.audio, purely through a configuration change.

No code changes are required.

What Is Fish.audio​

Fish.audio is a modern text-to-speech platform focused on high-quality, expressive voices and fast iteration for developers.

One notable aspect of Fish.audio is the breadth of available voices. It offers a wide range of voice styles, including voices inspired by public figures, pop culture, and anime culture references, which makes it easy to experiment with playful or character-driven agents.

In addition to preset voices, Fish.audio also supports voice cloning, allowing developers to generate speech in a customized voice when needed.

These features make it particularly interesting for conversational and personality-driven voice AI systems.

EchoKit is designed to be provider-agnostic. As long as a TTS service matches the expected interface, it can be plugged into the system without affecting the rest of the pipeline.

The Exact Change in config.toml​

Switching to Fish.audio in EchoKit only requires updating the TTS section in the config.toml file:

[tts]
platform = "fish"
speaker = "03397b4c4be74759b72533b663fbd001"
api_key = "YOUR_FISH_AUDIO_API_KEY"

A brief explanation of each field:

  • platform set to "fish" tells EchoKit to use Fish.audio as the TTS provider.
  • speaker specifies the TTS model ID, which can be obtained from the Fish.audio model detail page.
  • api_key is the API key used to authenticate with the Fish.audio service.

After restarting the EchoKit server and reconnecting the device, all voice output is generated by Fish.audio.

Everything else remains unchanged:

  • ASR stays the same
  • The LLM and system prompts stay the same
  • Conversation flow and tool calls stay the same

With Fish.audio added to the list of supported TTS providers, EchoKit’s voice layer becomes even more flexible — making it easier to experiment with different voices without reworking the system.

Want to get your own EchoKit device and make it unique?

Join the EchoKit Discord to share your welcome voices and see how others are personalizing their voice AI agents!