Hello:

For extreme fuzz sounds I do the following:

I use a Metal Muff w/top Boost to push up the Big Muff. It’s quite simple: Put the Big Muff first and Metal Muff immediately after, so you can control the Big Muff while redefining the sound with the Metal Muff 3-EQ band, plus the Top Boost.

The range goes from chainsaw tones to a heavy bass grinder.

Even more: You can set the Metal Muff to minimum gain to act a simple boost for the Big Muff.

Good luck!

Regards from Spain.

Nacho