We found a good work around to our looper problem. Instead of using two loopers, we are using one looper that is receiving both of our signals through a mixer. This actually seems to work a lot better for us and is a seamless way to loop the two instruments. I got the idea after seeing KT Tunstall. She does some very cool things with the looper. Check out her set up HERE. Click on gigs and then "wee bastard pedal" at the top of the page.