Power off all equipment before making connections. Plug the pedal into the "Control In" slot on the back of the effects processor. Connect the AC adapter to the back of the effects processor, and power it on.
Select the patch you want to use for the pedal by using the "Bypass/Tuner" foot switches, which are located on the front of the processor.
Set the "Modulator selector" knob to "Play" mode. If you set the pedal in "Bypass" mode it only works as a volume control pedal. Hold down the "Rhythm" key, and turn the "Value" knob to select the device to control with the expression pedal.
Press down on the pedal to set the pedal settings for the selected patch. Plug the guitar into the "Input" slot on the back of the processor, and test the pedal settings.