voiceover-emotion-coach

name	voiceover-emotion-coach
description	Use when adjusting TTS delivery, preserving original AI voice character, controlling low-intensity prosody, pacing, emphasis, or optional IndexTTS2/CosyVoice emotion prompts for reusable paper explainer voiceovers.

Voiceover Emotion Coach

Core Rule

Preserve the original AI voice character first. Delivery direction belongs in delivery_style and optional engine_emotion_prompt; it must not replace the voice personality or be inserted into source_text, spoken_text, captions, or hidden narration cues.

Workflow

Use this after technical-script-reviewer and pronunciation normalization, and before representative TTS samples.

reviewed script -> spoken_text -> delivery_style -> optional engine_emotion_prompt -> sample-first TTS -> ASR/human review -> workflow-optimizer

Output Contract

Create or update an episode-level delivery sidecar, usually near the TTS manifest. Default to preserve_original_ai_voice, not a new acting style:

{
  "status": "planned",
  "scope": "reusable_across_episodes",
  "delivery_style": {
    "mode": "preserve_original_ai_voice",
    "prosody": "low_intensity_prosody",
    "tone": "clear, stable, lightly AI-like, not theatrical",
    "pace": "keep original pacing unless a formula needs clarity",
    "energy": "low to medium-low"
  },
  "engine_emotion_prompt": {
    "engine": "indextts2",
    "use_emo_text": false,
    "emo_text": null,
    "emo_alpha": 0.0,
    "use_random": false
  },
  "segment_overrides": {
    "seg_001": { "intent": "keep original AI voice, only clarify hook emphasis" },
    "seg_formula": { "intent": "preserve voice; slow formula words only if needed" },
    "seg_summary": { "intent": "stable recap without theatrical warmth" }
  }
}

Reusable Delivery Palette

Situation	Delivery direction
Opening hook	Original AI voice, slightly clearer emphasis
Feynman analogy	Clear and stable, not overly humanized
Formula or symbol	Precise, maybe slightly slower, no acting
Modern LLM example	Practical, steady, no forced excitement
Risk or caveat	Calm, credible, not alarming
Ending CTA	Conclusive, restrained, no hype

Engine Notes

• IndexTTS2: default to use_emo_text=false, use_random=false, and preserve the reference prompt's original delivery. Use emo_text only as an experimental escalation after human approval.
• CosyVoice: keep emotion and pacing instructions in the engine prompt or instruction field, not in spoken_text.
• F5-TTS or GPT-SoVITS: use only neutral reference audio and external delivery notes; do not put emotion tags in the target text.
• English terms such as ChatGPT, Claude, token, Attention, softmax, KV Cache, and Multi-Head Attention remain whole words. Emotion must never cause spelling, drifting, translation, or repeated terms.

Self-Optimization Loop

After sample review, write improvement candidates instead of silently changing the mainline:

• If the voice is flat but still acceptable, prefer subtitle/visual/sound-cue support before changing voice character.
• If formulas are rushed, suggest formula-specific pacing overrides.
• If English terms drift, lower expressiveness and prioritize pronunciation normalization.
• If the delivery becomes theatrical, reduce energy and remove excited wording from emo_text.
• If the voice feels pressured, teacher-like, or unlike the original AI voice, switch back to preserve_original_ai_voice with use_emo_text=false.
• Route durable changes through workflow-optimizer; do not auto-update shared skills without human approval.

Forbidden Actions

• Do not add emotion tags to spoken_text; keep all emotion hints in delivery_style or engine_emotion_prompt.
• Do not add cue words like "重点来了" unless they already exist in approved source_text.
• Do not skip sample-first, ASR transcript diff, or human listening review.
• Do not replace the original AI voice character with a teacher, host, broadcaster, or sales style.
• Do not use unlicensed emotion reference audio.
• Do not trade term clarity, formula clarity, or transcript fidelity for expressiveness.