How do I switch the polarity of my FC4 pedal on my Yamaha PSR-225GM Keyboard...

How do I switch the polarity of my FC4 pedal on my Yamaha PSR-225GM Keyboard?

Per Yamaha one of the two possible fixes will solve this problem for you.

Turn off keyboard, hold down pedal while powering unit on.

or

Turn off keyboard, turn on keyboard, press pedal one time.

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