Kawai CN25 Owner's Manual page 44

Troubleshooting
Resetting the User Key Volume setting
Press the CONCERT MAGIC, LESSON, PLAY/STOP, and REC
buttons simultaneously.
The LED indicators for the CONCERT MAGIC, LESSON, PLAY/
STOP, and REC buttons will start to flash, and the volume
values of all 88 keys will be initialized.
Exiting the User Key Volume setting
Turn the instrument's power off.
* This setting will be stored automatically, and recalled every time the instrument is turned on.
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