Thank you. I left the unit alone for awhile, went thru the calibration proceedure (again) and when I finally got response, I pluged in and played. The pedal continued to work as a volume pedal, but about the 2nd or third switch to using the wah, ie engaging the toe switch, the pedal lost connectivity . I wonder why letting the unit sit for a few hours resets the ability to used the pedal again if indeed a short is causing it to go out in the first place? very frustrating and odd