granted I'm a bass player, but, I do end up jamming doom metal with guitar every now and then (electric wizard, cult of Luna, braveyoung/giant, jesu type stuff). Big muff just don't get there looses clarity. I got a custom mod. Russian muff that dose pretty well. But by far the sickest fuzz I have messed with is the one I use as a sans amp for my bass, the Zvex Woolly Mammoth. main bummer is that those pedals run about $350, but its worth every penny.