Ah I now noticed that you had posted about using the SyncLab add-on over on the operator forum. Is that required for practical use of Op-1 clock?
Now
Seeing as mode 5 of the vanilla Oplab does this:
Output CV2: modular sync.
4 pulses per quarter note.
connect to sync input on eurorack modules and sequencers that use this format.
No cv/gate reslly then in addition to this, just the Teenage Engineering PO and start/stop for the remaining 2 outs.
(I actually sold my Oplab, still holding on to the OP-1).