This is a DIY Buchla 281 Function Generator, built on the printed circuit board by Toppobrillo. The discussion on Muff’s message board has the details. It’s actually one half of the circuit of the original 281, which had four generators. As usual, my design wanted to fit into a 1U panel. This required some feature compromise in CV. Although each of the two function generators has CV inputs to control the rise and fall rates independently, I provided only one CV input that controls both. I also omitted the peak output feature.
Be sure to look at the Toppobrillo page that describes the module. Here’s a photo of my build.