Something I noticed on my Rat and then my first two fuzzes. I set the Rat for a little higher volume, roll back the guitar volume knob just a bit and it gets much more harmonically complex and much more responsive. A magical sweet spot that just sings. The fuzzes (Fulltone ‘69 and Moollon Octavia) do as well but nothing like the Rat. None of my other drives do this. What is going on to cause this? Any other pedals do this?