This looks really interesting.

I feel like there is a lot of room to build great voice-based agents that don't exist right now.

I have found that ChatGPT voice mode is unusable (e.g. hallucinates me saying things); Claude voice mode is usable, but very buggy around tool calling, and it often mishears things. And it only supports Opus, not Fable (though it looks like you don't support either of those). But I use it anyway.

Question, do any of your TTS options support increasing the speaking speed?