[ramonesfreak]

You have the pedal correct. That's the big muff sound.

I have no problem gettin good tone from fuzz pedals, including big muff, with my amps. I only play tube amps..fender, vox, Victoria

Mess with your settings and see if you can dial it in.

I did sell my muff in favor of a black arts Pharoa Fuzz as it has more control over mid range and it cuts through a mix much better