I can't resist this. We used to have to build our own gear. Who could afford to buy a Moog or Buchla? So in 1979 I started building a PAIA 8700c computer-controlled, 3-voice analog synth. It had a 6502-style microprocessor, touch pad hex programming, programmable drum kit, Pink Tunes fractal music generator. A wonderful piece of gear.
It took about a year to build. Prior to that I built lots of Heathkit gear that you can see in the background. Obscured by the lamp is a Heathkit dual-trace oscilloscope.
This was before MIDI, before Apple, before CDs, before the dawn of modern civilization.
If anyone want to hear some of my music made on that, here is one I made in 1982, called "Meteor":
http://www.arachnaut.net/audio/Meteor.mp3