Fish Audio S2 Pro underwhelms, MOSS-TTS next

Fish Audio feels like a strong demo trapped by a weak shipping story: if the voice still sounds flat and the license limits commercial use, the benchmark win doesn't matter much.

• –Fish Audio's own license allows research and non-commercial use, with commercial use requiring a separate license.
• –MOSS-TTS is the cleaner open-source bet: Apache-2.0, 20 languages, zero-shot cloning, long-form stability, and code-switching.
• –Qwen3-TTS is worth testing if you care about voice design and latency; the official repo advertises voice design, rapid cloning, and 97 ms streaming.
• –If emotion tags still collapse into robot voice, the real problem is usually conditioning, data, or decoding controls, not the whole TTS category.