About Product: Sound Effects and Rock Styles: 4 Rock Styles: These likely refer to preset rock music styles that can be used as accompaniment. 4 Sound Effects: These could include a variety of sound effects like clapping, drums, etc. Time and Volume Control: Grades of Time Control: This might refer to different tempo settings or timing adjustments. Grades of Volume Control: Four levels of volume adjustment for managing the loudness of the output. Record and Playback Functions: Record Function: Allows the user to record their playing. Playback Function: Enables the user to play back what they have recorded. Roulade Function: This likely refers to a feature for playing fast musical runs or sequences automatically. Demo Music: Pre-loaded demo songs that can be played to showcase the keyboard's capabilities.