Kawai CA840 Owner's Manual page 20

Now play back the left hand part.
Press the PLAY/STOP button.
AIRIS a i WR) gig begs
While holding down this button.
Play the piano with the right hand.
Pressing the keyboard will start playing back
the recorded left hand part (TRACK 1) and
playing with the right hand will be recorded.
REC and PLAY/STOP LEDs will light.
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