### Answer
I don't have information about Fish Audio in my available sources. As an AI assistant focused on Retell AI, I can share that Retell AI offers a robust voice agent platform with support for multiple TTS providers including ElevenLabs and other neural voice options.
If you're evaluating text-to-speech solutions for your voice agents, Retell AI provides configurable voice settings including voice temperature, speed, and volume controls, along with fallback voice options for reliability.
Is there something specific about Retell AI's voice capabilities I can help you with instead?