I just built a cheap DIY Fuzz kit from a supplier in china. First, I have to say, for a $20 kit, shipped, it's pretty darn good. IC sockets, decent quality parts, good PCB. I initially thought it was a Muff Fuzz, but I believe it to be something different, due to various differences I've found. Anyway, it sounds really good. I should mention it's not totally stock. I changed/added some diodes, and this pedal is running a mixture of silicon, germanium and Light Emitting diodes, and higher forward voltages. My one peeve is that at higher 'sustain' settings it starts to get some strange gating and artifacts. It's most easily repeated by doing pinch harmonics, which it will gate the initial attack a bit. Could this be due to the slew rate of the IC chips? Or perhaps I should address the diodes more. I believe the final pair of diodes could potentially use a higher forward voltage, as the LED's in front of them are probably hitting them with a lot of voltage compared to the original design. Unfortunately have no schematics, and this layout is the best I can offer. As far as the current diode situation. The bottom pair (as viewed in the picture above, as oriented) is ~.6V silicon - .5V silicon in series w/ ~.28V germanium the pair of diodes second from the bottom are both LED's one approx. 1.8V the other approx. 1.65V The top pair, are stock, both .6V silicon, I'm thinking this pair perhaps is being 'overloaded' at high gain and could perhaps use a bit more FV.