I've done a lot of work with test equipment (aka "raw electronics") over the years, but I got one of these recently. Then I finally found some docs for it...and noticed that, to some extent, the EG&G Universal Programmer Model 175 shares a lot of functionality with Make Noise's Maths. Hainbach's also got one, and the awesome Willem Twee studio in den Bosch has one or two. It's a very strange beast, but have a look and you'll see some parallels: http://www.telesoniek-atelier.nl/images/TAR02_175.jpg
Oh, yeah...it doesn't output anything beyond +/-10V...also making it potentially useful alongside a modular. It'll also interface nicely with this module: https://www.modulargrid.net/e/metro-modular-mm3203a-test-eagle