My Switch-3 footswitch doesn't work correctly with my unit, sometime I have only one switch that works other time it does not work at all.
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.