I recently upgraded from a dgx 630 to the 660. On the 630 there were features that allowed me to play a track and then basically press any key and the note that would be played would be a note native to that song. Basically I could play any key and it sounded correct. I want to know how to program the dgx 660 to do the same thing. Please help! I'm a novice player at best and really enjoyed that particular function.