VOICE_LIBRARY_ENHANCEMENT_COMPLETE.md

✅ Voice Library Enhancement Complete

🎯 Problem Solved

The Voice Library UI was missing advanced TTS parameters (Min-P, Top-P, Repetition Penalty) that were available in the backend but not exposed to users.

🛠️ Changes Made

1. Enhanced Voice Profile Storage ⚙️

• Updated save_voice_profile() function to accept and store:
  • Min-P (default: 0.05) - Minimum probability threshold
  • Top-P (default: 1.0) - Nucleus sampling threshold
  • Repetition Penalty (default: 1.2) - Token repetition control
• Incremented version to v2.1 for backward compatibility
• Enhanced status messages to show advanced settings

2. Enhanced Voice Profile Loading 📥

• Updated load_voice_profile() function to return new parameters
• Added backward compatibility - old voice profiles get sensible defaults
• Enhanced status messages to show profile version

3. New Voice Library UI Controls 🎛️

Added "Advanced Voice Parameters" section in Voice Library tab:

🎛️ Advanced Voice Parameters
├── Min-P (0.01-0.5) - "Minimum probability threshold for token selection (lower = more diverse)"
├── Top-P (0.1-1.0) - "Nucleus sampling threshold (lower = more focused)"  
└── Repetition Penalty (1.0-2.0) - "Penalty for repeating tokens (higher = less repetition)"

4. Enhanced TTS Generation 🎵

• Updated core generate() function to accept new parameters
• Updated generate_with_cpu_fallback() function for fallback mode
• Updated generate_with_retry() function for robust generation
• All TTS calls now use voice-specific advanced parameters

5. Enhanced Voice Configuration 📋

• Updated get_voice_config() function to include new parameters
• All audiobook generation now uses saved voice settings
• Backward compatibility maintained for existing voices

6. UI Integration 🔗

• Save Button: Now includes all 3 new parameters in voice profiles
• Load Button: Populates all UI sliders with saved values
• Test Button: Uses advanced parameters for voice testing

🎮 User Experience

Before ❌

• Only basic parameters: Exaggeration, CFG/Pace, Temperature
• Advanced TTS controls were hidden and inaccessible
• All voices used default Min-P/Top-P/Rep-Penalty values

After ✅

• Full control over TTS generation parameters
• Professional voice tuning with industry-standard controls
• Per-voice customization - each voice can have unique settings
• Backward compatibility - existing voices continue working
• Enhanced voice testing with all parameters

📊 Technical Benefits

Voice Quality Control 🎭

• Min-P: Fine-tune creativity vs consistency
• Top-P: Control focus vs diversity in voice generation
• Repetition Penalty: Eliminate unwanted voice repetitions

Professional Workflow 🎯

• Voice artists can now fine-tune voices like professional TTS systems
• Each character voice can have unique personality parameters
• Better control over audiobook consistency and quality

Future-Proof Architecture 🚀

• Versioned voice profiles (v2.1) support new features
• Clean parameter passing through all generation functions
• Ready for additional TTS parameters in future updates

🧪 Testing Recommendations

1. Create New Voice: Test all advanced parameters
2. Load Old Voice: Verify backward compatibility
3. Generate Audio: Confirm parameters affect output quality
4. Multi-Voice: Test advanced parameters in character dialogue
5. Volume + Advanced: Test combined normalization + advanced settings

✨ What Users See Now

When saving a voice, users get confirmation like:

✅ Voice profile 'Deep Male Narrator' saved successfully!
📊 Audio normalized from -12.3 dB to -18.0 dB  
🎛️ Advanced settings: Min-P=0.03, Top-P=0.9, Rep. Penalty=1.3

When loading a voice profile, version info is shown:

✅ Loaded voice profile: Deep Male Narrator (v2.1)

The Voice Library now provides complete professional-grade TTS control! 🎉