Maybe this should go into the general Tips and Tricks thread, but I think sequencers in OP-1 are complex enough to warrant a separate set of posts. I remember there were quite a few tips in that regard on the old forum.
Something important I recently discovered: you can go beyond two octaves while playing -- in real time! This was a very annoying limitation that I thought could only be bypassed via recording stuff into Finger or Sketch. Apparently not:
1. Switch to Pattern, Sketch or Endless.
2. Erase all notes.
3. Switch back to synth screen.
4. Hold down a key.
5. Press left or right arrow to shift octaves.
Your old notes will continue to sound uninterrupted as long as you hold the corresponding keys.
I don't know why it works this way, but somehow erasing all notes from the sequencer switches OP-1 into an entirely different key tracking mode more akin to how Analog Four does it.