Line 6 gave me the procedure for re-calibrating my xt Live to get the volume/wah feature working. This had no effect. Does anyone know if there is a known or recurrent reason for this failure, and a fix? The manual volume knob is functional which is on a separate circuit board than the vol/wah pcb so I'm leaning in the direction of the vol/wah pcb. Anyone have thoughts, experience or ideas that might help....GMB