Donny had a good idea about using a pedal in the meantime.
If you have a free pedal, just press DIRECT ACCESS and then step on the pedal...at the opening screen, use buttons "C" and "D" to highlight MAIN C in the window.
Store in the registration memory.
You probably know this already, but just in case...
Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.