I have a Roland EV-5 expression pedal that I can map in MainStage to function perfectly with the wah wah pedal in Logic's (MainStage's) pedal board. Trying to do the same thing in Logic. I can map it, but it the response is either the pedal position all down or all up. I've tried this in both controller set up and smart controls. Anybody have a tip on this? Much appreciated.