Frank,
After posting the last message, I diss-assembled the foot switch and checked the volume control outside the housing and found that it had more travel on the high end. Putting it back together I made adustments on the control mounting position which allowed me to use a different section of the control. The adjustment is rather critical. If you ajust it so that you can barely hear a sound with the pedal in the minimum position it works perfect. Hope you can understand my explanation.