Does anyone know the best way to set up the Digitech looper live? I had a mic and my electric guitar plugged into the looper and then I had the looper plugged into the board of a PA. With each loop I added during my show I kept getting more and more feedback. I'm assuming its because the mic was also looping the sound from the PA, ontop of what I was playing.

How do I avoid this? I've seen great loop artists like Andrew Bird and Merril Garbus pull this off without a hitch. What am I doing wrong?

Should I be connecting the loop pedal to an Amp and then mic the amp? Is it a matter of setting the levels? Is it the mic?

I'm lost.