ill have to check when i have them in front of me, i was going back and forth changing settings and confusing myself a bunch lol.
if i had to guess tho, i likely had everything set to OFF in the op-1f midi settings except for CLOCK, which is set to OUT. then on the ep133, i think all you need to do is go to the settings > MIDI > set to IN.
then i have audio from the ep133 going into the op-1f. the sequencer on the ep133 starts when you press play on the op-1f, so you can get those perfect loops by holding record on the op-1f before pressing play