My favourite FuzzBox (RadioShack elecronic reverb)doubles as a synth!! In order to boost the gain from clipping the mic input, I had to create a feedback loop using the line in/out. Playing with the Depth, Delay, and Volume sliders gives some pretty wicked tones!!
Repeat slider does nothing, as the unit is already infinitely looping.
Max Butler 50w tube amp, 20w Panasonic home speaker.