Tom,
I will also put my two cents it here. Yamaha even called me to see if I found this new function (which can be shut off if you like) alowing the user to hear the sounds of the chord tracks and bass track even when you are not starting the accomp. rhythm. This was a feature in old Yamaha keyboards but not in the newer ones.
George Kaye
Kaye's Music Scene
Reseda, California