Six default + description tightenings from upstream-source research:
- **Kokoro voice**: af_bella → af_heart. Per upstream VOICES.md, af_heart
is the only A-rated voice; also the kokoro-fastapi container's own
default. Applied to both kokoro (v2 → v3) and kokoro-captioned (v1 → v2).
- **SAO negative_prompt**: "Low quality." → "low quality, average quality".
Per diffusers official docs Tips section — the lowercase comma-separated
shape is the explicit recommendation; the period form was a code-example
string, never a documented default. SAO bumped v1 → v2.
- **SAO prompt description**: added the model card's canonical examples
("128 BPM tech house drum loop", "the sound of a hammer hitting a wooden
surface") plus the Tips advice on descriptive prompts.
- **VibeVoice voice**: en-Carter_man → en-Alice_woman. Per upstream model
card, Alice is the documented default. Description now flags the
Alice-injects-BGM-for-intros foot-gun + the `_bgm`-suffix meaning.
VibeVoice bumped v2 → v3.
- **Fish-s2 text description**: added multi-tag placeholder example
combining emotion + physical tags, per upstream best-practice docs
(physical tags "feel flat without emotional context").
- **ace-step prompt description**: added the upstream Gradio UI's
pre-filled tag string as the canonical prompt-shape example.
Surfaced separately to lkraven (NOT applied here, need decisions):
- Voxtral voice "alloy" may need to become a native preset like
"neutral_female" — depends on whether vLLM-Omni translates OpenAI
aliases.
- Qwen3-TTS — research found 17 presets (Cherry, Ethan, ...) that the
catalog currently says don't exist. Catalog says clone-only; needs
wrapper-level verification before adding.
- Kyutai-TTS — service down, can't probe /v1/audio/voices. Default
remains undefaulted.
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