The oscillating fuzz is capable of hundreds of different fuzz tones with it's blend, fuzz, oscillation, and gate controls, while the feed back loop can mutate any of your other effects into a new noise generating machine of doom. By moving shadow or light in front of the photo eye you can manipulate the intensity of the feed back loop which can make high gain pedals act like a theremin.
Truly Beautiful Disaster page at Effector13's website...