I just bought a Big Muff for 40 bucks used. I just wanted to see what it was like. It's kind of cool but I'm still figuring out where it need to be in the rig if at all. Started out front of the chain but kept moving it in to before the compressor. It dramatically get's tamed once a TS9 gets turned on. Also the switch is a bit hairy upon activating the pedal. I might get in there and do a little switch work. Still kind of cool for Black Keys sound and such.