Scott..Replying again to your full keyboard mode problem. I have just checked out my friends PSR9000 with latest OS 3.1. It still unfortunately adds the extra notes from the right hand to the left hand chords in full keyboard mode as per your PSR2000.

PSR9000 Pro I am told (Perhaps 9000 Pro owners can confirm this) with the new OS 2.1 does keep the chords clean from being added to from the right hand melody notes when in full keyboard mode. I think its called A1 mode. Why Yamaha decided not to add this facility to the latest OS on the 9000 is your guess?

Graham UK