@jepyang In a way. Basically I'm trying to build a matrix router so I don't have to switch everything around when I want to change inputs to the computer/DAW or send things out to an effects pedal, etc. So the knobs are just input attenuation, and I'll have a final output attenuation as well (once I get that part built. Eventually I want 16 in, 8 out... building it modular like so minimum counts at the JCLPCB (or elsewhere) don't cost a fortune while prototyping.