Reply to Custom Filter Box

I'm considering building myself a little box with dedicated channel filters, completely analog, to stick in between my soundcard and my mixer. I'm changing my mixer to rotary as the faders are bleeding horrifically, and believe this would be a fun little project to do. I wanted to ask if anyone ANYWHERE had a schematic of a Xone 92 filter, or could give me some info as to what variable resistors and standard resistors are used to give it that classic A&H sound?