Hello. I have a Marshall Code 100 Head, 4 12 cabinet and the 2 12 combo amp. Absulutely love these amps. I also have the 3 way footswitch. What I can't figure out, is how to be able to turn off and on the REVERB from the foot pedal. Is there a way for this? It defaults to allow you to access the Distortion, Modulation and Delay but what about the reverb? Any ideas?