I believe @Omri_Cohen has an Ultralite Mk4 or 5. I also recall him saying something like that he has abandoned sending pitch from the computer to Eurorack, because it’s simply too much work with the constant pitch calibration.
I have an ES-9 myself, but to be honest, if I were starting from scratch today, I would seriously consider getting a good MIDI interface for my Eurorack instead. Less hassle, more simplicity and robustness. But for some things you will need to latency compensate as well, both for DC audio and MIDI. Such is life…
For what it’s worth here’s a guide and overview I wrote of what’s involved: