Can I Use An Electro Harmonix Expression Pedal With Any Of The Hd 500's Inputs? in POD HD Posted September 29, 2013 The pedal 2 light coming on indicates that it is active. Don't know about the screen changing - did you knock a knob? What did you expect to happen? Expression 2 by default doesn't do anything - have you assigned it to control something? I use it as a master volume so I have a volume last in the chain with Exp 2 set to control volume Honestly I didn't know what to expect, but I did forget to assign the pedal to a function, LOL. I guess when I saw the screen changing and light flashing when the pedal was moved I didn't like that and just unplugged it and went to playing instead of fooling around with it. I'm going to try it again later, thanks for all your help with this Rewolf48. I'll let you know what happens.