The trick is to get a perfect combination of your guitar’s volume control and settings on the fuzz. Input resistance and voltage bias, as well as the fuzz’s volume and fuzz controls all play a role.
There are so many sounds to be had from the Fuzz Face circuit! Everything from sparkly clean crunch to extreme wall of distortion tones can come out of one of these boxes. There are also many great tones to be had by using the guitar volume knob with a fuzz face and I talk about that extensively here.
In this video I discuss using input resistance, guitar volume, and bias settings. The fuzz face is very sensitive to all of these little changes.
Input resistance almost works better to control the distortion than the actual fuzz control, and on a fuzz face the bias control can take it from splatty dirt to sparkly grit with great clean up.
I still consider this the best fuzz I’ve ever owned… it’s just one of those magic sets of transistors I guess.