Bill,
You can do this in the keyboard's onboard Style Creator program, then save the style as a custom style in your user area. To get to the program, press Function/Digital Recording/Style Creator.
You'll also find lots of information pertaining to style editing at
www.psrtutorial.com in the lessons section.
Cheers,
Gary

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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!
K+E=W (Knowledge Plus Experience = Wisdom.)