Brown Sound in a Box II

Description from the General Guitar Gadgets site:

Brown Sound In A Box version 2 (BSIAB2) is an excellent distortion pedal designed by Ed Guidry. Based on the AMZ MiniBooster cascading work done by Jack Orman and further refined by Aron Nelson and Doug Hammond.

This is one of the best heavy Marshall-type distortion boxes that we've heard and it also performs very well on low drive settings.

Modded version with Contour pot

Geiri's demo of his build: