Roland Jupiter 4 with Mods

via this auction
"It is not a VCO on a chip... The VCOs are discrete (it actually uses the same kind of electronic piece as the early revision Minimoogs), rather than the on-chip design so many others went for soon after (Like the OB8, Prophets, Memorymoog etc). This gives it a really monstrous analog sound.

This unit was outfitted with a brilliant mod that allows CV/Gate control over each of the four voices. This is much more useful than simple midi as you can control this from analog sequencers, drum machines, a modular, or if you'd like, a midi to cv unit or silent way. I used this unit with Ableton Live and Silent Way running through a MOTU Ultralte MK3. I recommend using this with Silent Way as you have full control of each voice allows you to do things like apply LFOs to detune each voice. Nevermind what I said earlier; the most powerful sound is running CV/Gate into each of the 4 voices, dropping 2 voices down an octave and having LFOs subtly modulating the pitch on a few of the voices, therefore turning this into a 4 VCO discrete monosynth! It's astonishing the amount you can do with this. There are switches next to each set of CV/Gate so you can turn on and off the feature if you'd like. Sometimes, I'd like to just run one voice into the CV/Gate for a bassline and use the others to play melodies and such..."