You are looking to build THE Fuzz but want some clever extras? The Blackout effectors Musket Fuzz ™ is based on the Russian Muff but adds plenty of little helpers added to that famous circuit known for its endless sustain. So it can sound like many different versions of the Big M but still gives you full control over the capabilities of the circuit. The Focus knob cuts the low end to tighten the attack for a more modern fuzz sound. That’s not only fun for guitar players. It also lets the dudes on the bass join the party. The tone control has an extra dedicated mids knob to prevent you from getting lost in a band situation. The Pre knob lets you add extra gain and can sound like you are stacking an overdrive before the fuzz. Volume, tone, and gain give you the controls you used to have on this kind of pedal and allows you to dial in the classics sounds you expect.
For further analysis on this circuit take a look at this thread on Free Stomp Boxes Forum