I have been trying to use an RC-3 with my Line 6 Spider IV 75, the first loop sounds great, but when I try to play along side it or overdub, it is real choppy and sounds like half volume. For example, say I loop a rhythym, then try to play lead while the loop is looping, it sounds horrible, choppy just not what I wanted. ANY body have any advice or comments. Thanks, Spent $ 200 for the RC-3 and can return it but only for like 3 more weeks. ( 30 day return policy ) Thanks for any advice anyone has.