Loosely based on the fuzz face circuit with the addition of a 6 position frequency selector. It is actually a hybrid. Up front it has a Germanium transistor (40 years old, pulled out of early sixties Italian keyboards) for smooth clipping and followed by a high HFE silicon transistor for power. It is an exceptionally loud pedal. You can use it on any amp and it certainly will work well with any Marshall plexi-amp, or a Vox as well. This is the first fuzz pedal on the market that gives you that kind of flexibility. The best way to describe it is to listen to the clips that are posted. Once again, bear in mind that I only have a limited number of those transistors with the proper HFE...
As for the updates on the 2.0 version:
The board will now be "hot", which means that the moment you insert a jack in the input, you will be drawing current from the battery or adapter. That is how most pedals are wired. Without that feature you were able to hear a pop when engaging the pedal, however the battery could last close to a year without replacement. The trick was to engage the pedal on the downbeat but some players did not grasp that concept, so I decided not to have to deal with their complaints by eliminating the problem altogether.I also now use a linear pot for a fuzz pot rather than an audio pot.
I realized that the full sustain did not come on until the knob was at 85% but the advantage of that was that you could set up the pedal below unity gain, which you could not do with the audio pot.
I also changed the hybrid transistor to give you a more solid and powerful system.The reason I did that was that most of my pedals are so strong that many customers were expecting all the pedals to jump at them. The Afro Fuzz which is designed using some of the principles of the Fuzz Face was not as loud, so I made it louder.
And lastly, you can now adjust the overall gain of the pedal by turning a thumbwheel inside the pedal which will change the bias of the transistor, thus affecting the gain.
The reason once again is one of taste, I personally do to want a pedal which is too hot, I'd rather use my amp to boost.
Also new sexier knobs, and new look.