As I said earlier,I had the same problem. However, when I used my Yamaha Pedal playing from the board, I had no problem. I made sure the mod wheel was at zero. When I had my volume drop was when I was playing a midi sequence. I, too, think there is a correlation there.

Bernie
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pa4X 76 ,SX900, Hammond SK1, Ketron SD40,Ketron Event X Centerpoint Space Station, Bose compact