Note: If a sustain pedal plugged into a Yamaha keyboard is producing the opposite effect - sustaining when the pedal is not depressed, and not sustaining when it is depressed - it's usually because (a) the pedal was plugged in while the keyboard was turned on, or (b) the pedal was depressed while the unit was powering on. This tricks the keyboard into thinking the default state of the pedal is depressed, resulting in a reverse polarity or reverse function. There's an easy way to remedy this: 1) With the unit turned on and the sustain pedal plugged in, depress and hold the sustain pedal while you power the unit off. 2) Release the sustain pedal once the unit has been turned off. 3) Turn the unit back on. If that doesn't solve the problem and further troubleshooting is needed, please contact our Support team here.