I was seeing what people's preference is: Big Muff into dirty channel or clean channel? Lately, I prefer my Peavey Delta Blues to be set on the dirty channel with just a little bit of dirt and then I use my boost pedal to give me an overdrive but am adding a Big Muff to my board soon. I used to have a Big Muff years ago that I used on an amp that was always a little dirty on the clean channel and the dirty channel on it sucked so I have no idea if I would have preferred it on a dirty channel. I wish I had not sold that Big Muff only to require me to buy one again. Lesson learned.