Guitarist Guild: A Musical Community Beyond Strings

Anyone seriously into loopers? 

Just wondering if you've found any neat tricks while playing around with them.  Do you use them for vocals, or just the guitar.  Can a looper in a multi effects pedal be used for vocals? I have a couple of multi effects with loopers built in but haven't really got into the looper side of things to be honest, which I must do when time permits.

And please post any good examples of loopers in action here if you find any.