This is less a mod report for existing pedals and more a guide to adding even more controls to a DIY Fuzz Factory.
The basic schematic can be found at http://basicaudio.net/Fuzz%20factory%20schem.PNG
In addition to the normal controls I added a BMP tone control with a mid switch, a pregain pot, and a filter switch
The tone control and mid switch are set up like this after the output cap:
The switch is a SPDT centre off. The left position is flat, middle is mid boost and right is mid scoop. This tone circuit is designed to have a flat response available as well as low attenuation compared to other BMP tone controls.
The pregain control is a 500kA pot set up in series with the input. It's a nice way of turning down the fuzz or tuning pitch shifting efffects.
The filter switch adds in a 10uF cap in parallel with the 0.1uF coupling cap (+ side connected to Q2's gate). When switched on, the fuzz has a fatter, gainier, gated-ier sound.
So, if any of you sickos are craving a fuzz with 9 controls, this could be the one.