This is a Kosmo format attenuverters module. Not much to say beyond that! There are three attenuverters. One has a switch to select 10 V input instead of the input jack. There are jacks for output of the sum and inverted sum of the three channels. Response to slider position is nonlinear, giving you finer control near the middle for setting small values.
Schematics, KiCad design files, Gerbers, docs here:
nice , you know if you have extras I am interested have to and to my Analog output rack 
and as soon as I have some cash thanks to your YT video on ordering pcb’s I will give it a go .
Yeah, I’ll have a few extras up on Tindie at some point.
I just wanna say @analogoutput - you have such beautifully clean schematics.
Why don’t you use switched jacks and have all the inputs normaled to +10V ?
Edit: just saw your comment on the schematic. When completely attenuated a normaled input shouldn’t be a problem.
A matter of preference of course. I just thought it seemed a cleaner user interface than having to remember to carefully center the slider on any channel not in use.
While trying to figure out how you achieve the higher precision towards zero, I noticed that on the PDF schematic there are two OUTSUM and two OUTSUM_P but no OUTSUM_N. That doesn’t seem right.
I don’t know if the KiCad schematic is different as I am on my phone.
Edit: nevermind, I just saw the negating bar. Sorry I need more coffee.
