Q: How can I reset my ProKeys 88sx keyboard to its factory default settings?

A: Simply turn the power off and back on.  On power up, the keyboard is in its default state of Performance mode, with all effects set to off, and the tuning, transpose and octave shifts set to zero. Any edits made of the types that are defined in part 1 of the manual will not be saved across power cycles since the keyboard resets each time you power up.