Kawai ES520 Owner's Manual page 36

Rhythm
 A djusting the Rhythm volume
Press the RHYTHM button.
Press the or MENU button to select "Volume", then press
the or VALUE buttons to adjust the rhythm volume.
* The volume can be adjusted within the range of 1~10.
* To reset the volume to 5, press the
simultaneously.
* To directly display the volume adjustment screen, press the VOLUME
button.
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and VALUE buttons