Interesting that you should say that. So that I could build my tearjerker wah, a friend donated me his Mission expression pedal (surprisingly, the footpedal enclosure is not only “like” a Dunlop, it was actually Dunlop stock with their trademark inside) -ANYWAY, never having used an expression pedal, I opened this one up expecting to have to remove a lot of electronics since the expression pedal was specifically designed to work with line 6 devices. You guessed it – when I opened it up, the entire enclosure was completely empty other than one jack wired straight to the pot that was manipulated by the wah treadle. Not a single other thing inside the enclosure. Unless there are Keebler elves hiding inside that help with the operation of the pedal, there really is basically nothing at all to an expression pedal.