Commodore 64 SID in a rack. Title link takes you there. Via gerald.
"A uCApps midibox SID, built in a 3U frac-rack modular synth panel. All the power of the midibox SID, with 6 routable analog CV inputs, two gate outputs, and 8 analog CV outputs. Since the midibox OS is open source, you can write your own apps for it, and turn it into a CV I/O beast!"