fix guide

app.py

@@ -237,7 +237,11 @@ with gr.Blocks(css=css) as demo:
     - Using full-length audio as reference is recommended for best results.
     - Use -1 to represent the start/end of audio (e.g. [[-1,25], [50,-1]] means "from start to 25s" and "from 50s to end").
 
-5. **Others** 
+5.**Generate Preference**
+    - Quality First: Higher quality , slightly slower
+    - Speed First: Faster generation with slightly reduced quality
+
+6. **Others** 
     - If loading audio result is slow, you can select Output Format as mp3 in Advanced Settings.                                
     
                         """)