i just got a new edp and im having some troubles. any recorded loop has this staticy/scratchy sound along with it. ive tried multiple cables, but can't get rid of it. when i just play thru the unit without recording, it's fine-- no noise. and while im recording, it's fine--no noise. but as soon as the loop starts playing back, it has all this noise with it. it's not a digital distortion noise; i am keeping the input at a reasonable level (no red lights). any suggestions?