It is basically the fuzz section from the Black Hole Symmetry taken apart. There is a single output volume control. It is loud and sounds huge.
We added a toggle switch to cut the output Low Pass at 3 different frequencies :
720Hz, 2,3kHz, 16kHz
The signal passes through a JFET transistor and 3 silicon transistors to end up being destroyed.
Completely built in France. From the enclosure to the circuit. Assembled by hand in our workshop.