This is the Ampeg V-7 Guitar Amplifier. The footswitch is a powered three channel XLR 5 Pin Configuration.  On the Main Board of the V-7 it controls what the switches modify. Located at the bottom of the schematic you will see where I labeled the 5 Pin XLR. Most of the time I wire my pedal to only have one button, for distortion. This unit above has the reverb and channel 1 as kick switches, pedal should be securely mounted to kick “ON” function.