Kenton have been making MIDI/CV solutions for a long time, in fact last year they celebrated their 30 year anniversary!!
One of the first companies to start making MIDI/CV retrofit kits for analogue synths it is great to see that they're still going strong. John Price was on hand to show off their latest products.
More info at Kenton
Older Music Machines & the People Who Still Use Them
Revisions that turned synths into brand new machines