Elektor Formant with Keystep

I’m gonna try to get an Elektor Formant playing at a concert soon, but the original keyboard has its quirks. Do you think I can use an Arturia Keystep to connect to it, as this project needs a 15V CV apparently. I understood the Keystep only puts out about 12V. Not sure if that would work.

There won’t be any negative voltage either I presume. Not sure if that will affect anything.

The Formant has a 5 pin DIN connector but I can work around that.