If you’d like to sync your OP-1 with Eurorack and have a spare Raspberry PI lying around, I’ve put together a guide:
There’s a small circuit involved to raise the Raspberry PI output to Eurorack levels, but it’s only a few common components.
The Raspberry PI acts as a USB midi host and sends out 5v clock pulses and you also get to keep your stereo output from the OP-1.
I’ve only tested this with the original OP-1, but if anyone discovers issues with the Field then let me know.
Hope that helps someone!