I've found with muffs, the trick is to keep the tone low. Turning it up high gives you more top end at the expense of low end, and you just disappear in the mix. Keeping it low, you can still be heard because you end up dominating the lows and low mids. In the mix though, it just sounds like a massive sustaining bass boost rather then a raspy fuzz. If you want the fuzz effect to be heard more, then a mid boost is in order. I'd recommend the new deluxe Russian model that has both a blend and a mid control.