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# Model Version Update Complete - V3.5 to V5

## ✅ Update Summary

Successfully updated the SoundStudioPro project from using **V3.5** as the default model version to **V5**.

## 📝 Files Updated

### Backend Files (Default Values)
1. **`create_music.php`** (line 28)
   - Changed: `'V3_5'` → `'V5'`

2. **`api.php`** (line 35)
   - Changed: `'V3_5'` → `'V5'`

3. **`config/database.php`** (line 635)
   - Changed function default: `'v3'` → `'v5'`

### Frontend Files (UI Dropdowns)
4. **`index.php`** 
   - Advanced Mode dropdown (lines 1658-1662)
     - Added V5 option as default
     - Reordered: V5 (Latest) → V4.5 → V4 → V3.5 (Legacy)
   - Pro Mode dropdown (lines 1939-1944)
     - Updated V5 label from "Experimental" to "Latest & Best"
     - Set V5 as default selected option

5. **`includes/create_music_modal.php`**
   - Advanced Mode dropdown (lines 63-67)
     - Added V5 option as default
     - Reordered: V5 (Latest) → V4.5 → V4 → V3.5 (Legacy)
   - Pro Mode dropdown (lines 344-349)
     - Updated V5 label from "Experimental" to "Latest & Best"
     - Set V5 as default selected option

6. **`index copy.php`** (backup file)
   - Updated both Advanced and Pro Mode dropdowns for consistency

## 🎯 Changes Made

### Model Version Options
- **V5** - Now the default option, labeled as "Latest" (Advanced) or "Latest & Best" (Pro)
- **V4.5** - Still available, labeled as "Premium"
- **V4** - Still available, labeled as "Balanced"
- **V3.5** - Still available but relabeled as "Legacy"

### Default Behavior
- All new music generation requests will now use **V5** by default
- Users can still select older versions if needed
- V5 is pre-selected in all dropdown menus

## ⚠️ Important Notes

1. **API Compatibility**: The code sends `"V5"` to the API endpoint. Verify that the API accepts this format (it may need `"V5"`, `"V5_0"`, or another format).

2. **Database**: The database column `model_version` default is still `'v3'` in the schema definition, but the function default has been updated. New records will use the value passed to the function.

3. **Existing Tracks**: Existing tracks in the database will retain their original model version. Only new tracks will use V5 by default.

4. **Testing Recommended**: 
   - Test creating a new track to verify V5 is used
   - Verify the API accepts "V5" as a valid model parameter
   - Check that callbacks still work correctly with V5

## 🔄 Rollback Instructions

If you need to revert to V3.5:
1. Change defaults back to `'V3_5'` in `create_music.php` and `api.php`
2. Change function default back to `'v3'` in `config/database.php`
3. Update dropdowns to set V3.5 as selected instead of V5
4. Update labels back to original descriptions

## 📅 Update Date
January 2025