Hello. As anyone can surmise from my post I know nothing about the pedals that can be used with the Helix. I have  a rack. If I have understand correctly I can use an expression pedal to change just about any thing I need, snap shots, increase/decrease things, etc depending on what instructions i have given the Helix. Now what I would like to know is: -will any generic pedal do the trick? (I have found several for about £50 at Thomann and perhaps a cheaper one at my local music store)