In a message dated 1/4/04 2:07:16 AM, Walt writes in his text file attachment:
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When you make a piano recording on your Disklavier, the instrument leaves open the possibility that you intend to make a Left/Right recording in which you will record a left-hand part on track 1 (also channel 1) and a right-hand part on track 2 (also channel 2). Then, on playback, you can cancel either part using the Left and Right Part Cancel buttons.
The Disklavier puts the duplicate pedal data on track 2 so that if you cancel the left-hand part, you will still hear the right-hand part with the pedalling. If you wish to cancel the pedalling, you push both the L and R buttons simultaneously.