I made this effect for a friend of mine. We call him Schuif. Hence the name of the effect.
It is basicly a Fuzz Face. A good explanation of the technology of the Fuzz Face, can be found here.
I've added two LED's to this effect. They are used to indicate four modes of operation.
The LED's are manipulated by the two switches on the side.
[Yes, I took the Bass Fuzz apart to create this effect]