Accent
2
BPM is global. This is the case with all Elektron machines.
Your best options are to program your tracks in the arranger, or if you have not updated to 1.25 C or D, there is a bug that holds the tempo+function parameter until you press another button, which let’s you dial in a new tempo that is activated once you exit tempo and press another button…something like that (I’m away from my OT right now but there are a couple of threads on it).
If you cannot utilize the bug, arranger is the next best thing. You may lose a bit of on the fly play depending on how you set it up (tho I wouldn’t sweat it for a short set), but you can program in pattern and tempo changes which might be useful for you.