Try this. go to the memory and control windon. at upper right, select footswitch. on the next window. under footswitch you will find two footswitch windows. on the second (last or 2) use the arrows at the right side to select "variation". If you use the #1 pedel for expression, sustain or other uses, set it for your use preferance, if you do not use a pedal then set it also for variation. I have had the same problem and this stop the sound problem.