Post your "Tricks for a Looper"

Ok, so I've got a RC-2 and it's become a great practice tool.  I'll play 3 chords in a blues pattern or arpeggio and come back and make up some lead lines.  Am, G, F, E (all in bar chord fashion) for example sort of like part of the song Pipeline is one example.  Not playing a song per se, but more like a variable backing track.

I found you can use connect a Boss FS-5U ($18) in the Boss RC-2 Stop/Tempo input to be able to instant stop. Rather useful compared to the way the pedal alone is stopped (two stomps within 1 sec of each other).   

Would be glad to hear of other tricks you are finding on this or other loopers.

Steve