I have the C4, but this is relevant because I'm talking about the filters here. Have had the C4 since it came out, but only really messed with user presets and tweaked those. So the C4 didn't make my board until very recently. I also have a 3Leaf Wonderlove, Micrtron III, IE XD, and Moog MF-101. The first of those three usually do envelope duties, but I like them all for different reasons. Anyway, I finally watched Zach Rizer's deep dive on the editor & spent some time going through each and every filter they have in the menu. I found one in particular that I absolutely love, and the tweakability, low end retention, fatness, and responsiveness is amazing. Dare I say this is the filter sound that's in my head...