I've got a little E-mu Xboard. It supports c.c. pedals. I've got my expression pedal connected to it, and I have the xboard midi'd into my PX-5S. On the grand piano, the exp pedal is doing the half damping function splendidly. Pretty cool. But how would I go about setting it to do volume swells on strings? That's what I really want to use it for.