Idk specifically, in theory it might work if you have op set to po sync but then you wouldn’t have op audio line out going thru anything… basically you’re gonna need a midi host. I have Kenton box it has midi in/out and 1 USB port
You can do it with the PONY sync on the new OS. You’d need to split the left and right audio channel with a cable and plug one into the sync in on the Keystep and the other wherever you need the sound. Of course you’ll only get clock sync that way.
USB Midi might be the easier option plus you’d be able to use the Keystep as a Midi to CV converter to e.g. drive a modular system with Midi signals from the OP-1.