This is an analog module that allows for uniform detuning and offseting of control voltages. It has a CV input and an offset input. It has outputs for the offset being applied positively, negatively and double offset applied positively and negatively. When used without the CV input, it can be used as a standalone inverter or fixed gain amplifier.
This PDF contains schematics, parts list and other information useful for building this module
Boards are available now. Price for 1 board is $8.
There are unfinished aluminum Eurorack panels available for this project. They are $8 each. For more information on my panels, check this page. If you'd like to drill your own, here's the template that I use, print it out at 300dpi