About Product:

1. 
   

   Sound Effects and Rock Styles:

   
   
   
   
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     4 Rock Styles: These likely refer to preset rock music styles that can be used as accompaniment.
   
   
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     4 Sound Effects: These could include a variety of sound effects like clapping, drums, etc.
   
   
   
   


2. 
   

   Time and Volume Control:

   
   
   
   
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     Grades of Time Control: This might refer to different tempo settings or timing adjustments.
   
   
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     Grades of Volume Control: Four levels of volume adjustment for managing the loudness of the output.
   
   
   
   


3. 
   

   Record and Playback Functions:

   
   
   
   
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     Record Function: Allows the user to record their playing.
   
   
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     Playback Function: Enables the user to play back what they have recorded.
   
   
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     Roulade Function: This likely refers to a feature for playing fast musical runs or sequences automatically.
   
   
   
   


4. 
   

   Demo Music: Pre-loaded demo songs that can be played to showcase the keyboard's capabilities.