Korg MS-20 mini and CV
Korg has been building amazing synthesizers for a while. And without getting into which synth is great or not, I still love all of their newer synths and workstations. One of my favorites for the older synths is the MS-20. They still produce the MS-20 with newer components and 84% of the original size and calls it the MS-20 mini. They also now have the MS-20M (a desktop version without the mini keys.)
Now let’s talk about Korg MS-20 and their CV implementation. Back before the MIDI and Soft Synth days, there was CV and gate/trigger and send control voltage to adjust a note/pitch (as well as do other thing) and gate/trigger to send a note on/off signal. Moog selected 1V/O (1 Volt per Octave) for their CV implementation and Korg selected Hz/V (Hertz per Volt) which based on the voltage, it set the frequency of oscillation. Yamaha used Hz/V as well, but almost all of the other implementation has been 1V/O. What happens when you plug a CV out to a VCO in on the Korg MS20 is that when you depress a note, it plays a note as expected, except the tuning is off. That is because of the Hz/V as opposed to what the CV out is sending (1V/O). Your expectation is that as you go up and down a scale of the keyboard, it would be in tune. That will not be the case with a CV out from a (1V/O) going into a Korg (or some old Yamaha synths.)
Korg has built a wonderful tool called the SQ-1 (which is the remake of the SQ-10 miniaturized with some modern features.) It supports Hz/V and 1V/O. I won’t go into all of the features of the SQ-1, but you can use a sequencer on a computer and connect the SQ-1 via USB to receive MIDI signals, which sends clock information and SQ-1 will trigger the MS-20 mini (via a sequence you created on the SQ-1).
The other option is to find a hardware sequencer that supports Hz/V like the Arturia Beatstep Pro and Audio Damage Sequence 1.
Enjoy.