You probably have the aux pedal assigned improperly. Hold down the encoder knob and the tap switch. Turn the encoder until it says "aux sw". Then press the encoder again. Turn the encoder and make sure that tap is not assigned to more than one parameter. ESPECIALLY where you can assign FS1, FS2, or FS3 (these are the very last parameters under "aux sw"). You can assign your aux switches to FS1, FS2, and FS3. But you shouldn't have it assigned anywhere else. And, if you want your switches assigned somewhere besides FS1, FS2, or FS3, you shouldn't have anything assigned to FS1, FS2, or FS3. I had the same problem because I had the switches assigned in two places. It's easy to miss assigning FS1, FS2, and FS3 because they are at the very end.