The footswitch must be plugged into the unit before you power on. If you plug the footswitch in when the unit is on, the unit can't determine if you have a 1 or 3 button switch. So always make sure you have the footswitch plugged in before you power the unit on. The unit uses a cable with TRS connectors on both ends, and not a standard TS cable ( guitar cable). Please be sure to use the included cable, or purchase the correct cable if you need a longer length. Please see the pictures below if you are unsure of the connector differences.