This is the 1985 "electronotes builder's guide and preferred circuits collection" and Bernie Hutchins is advising first time synth makers go buy chemicals at radioshack to etch copper and use a paintbrush to trace out wires manually. It's so weirdly analog and hands-on compared to the way circuit boards are made today I'm used to, "pay someone else online to do it"
the old hand drawn traces also give vintage boards a particular kind of beauty. they're organic in a way that reminds you of the hands that built the board. this one wasnt painted directly - it's one of a short run of boards from the late 70s or early 80s, but whenever i look at boards like it i can almost find myself in the head of the designer, thinking through how to route each connection, making little swirls that will soon carry sound