From Beetronics type: fuzz harmonizer. “The Swarm is an Analog Fuzz Harmonizer that sounds like a thousand killer bees coming to get you! It basically turns your input signal into a square wave, then multiplies and divides the frequency of that wave, giving you nine possible harmonies in two different octaves.
Wow! Great pedal. Lots of square wave tone. Solid build and looks great on my pedal board. This pedal is going to get a lot of use. Highly recommended.