Hi...I am running my Echo Pro (love it) between a preamp (Egnater M4) and a Randall RT2/50 tube power amp. It sounds insane except for the following small issue.......when I change switch channels and the delay patch changes, there is a (for lack of better words) digital sounding spillover or warping sound. Is there a way to set the unit so the effect is cut off when I make a switch? It seems like it would have to do with "ducking", however I am not sure, nor am I sure on what to do program wise. Any help would be awesome...thanks! Rick