What you are talking about is called "mix-down". It�s indeed an issue here. But I don�t believe that reducing volume of my part during playing is solution here. You know that if a singer doesn�t hear his voice in monitors loud enough his singing will seem like struggle. PSR keyboards aren�t able to route parts to different outputs, that�s why we can�t do everything right during life performance. Well, I�m just trying to let it go for now.

As for the expression pedal, I have such thing from M-Audio and it works well. I tried FC-7 and it didn�t seem to me to be much better. Actually, the one from M-Audio let�s you to change its straight by turning a small wheel on it. You can make it to change the volume only slightly, not the whole way.