Hainbach is a German synthesizer enthusiast who is a bit like the Youtube channel Look Mum/No Computer, and he a few years ago acquired lots of old test equipment and decided to see if he could use them to produced "synthesizer" sounds, and thus a type of music. He also has other sound samples which you can find out about on the website. It is on sale right now $39.
I want to get it, but I might have to wait. I'll see.