My PSR-S900 has a bug that I'm sure would have been discovered by other people with the keyboard if it wasn't peculiar to just my keyboard.

My keyboard is unplayable. When I turn the DATA SELECT wheel, the keyboard starts toggling between part select, upper octave and other parameters. The data wheel is basically broken. As you probably know, this is an essential part of the keyboard.

What a drag.

Beakybird