If the idea is making MIDI or better yet OSC out of your CV signals. It would also be very easy to do with an Arduino like @Fred said.
Oplab was discontinued, but I saw they are bringing out a new one. Its a great box for this.
https://www.rebeltech.org/product/open-sound-module/ is another one that has the advantage of doing OSC. Midi is a bit lo-rez for this