You’re correct. Tempo is stored globally. This is by design as most users DON’T want drastic BPM shifts.
I’d think that in cases where you do, it’s more of a classic setup where you’d stop between songs. If that’s the case you can change BPM then.

If not, there’s also the tap tempo option. That would take literally 2 seconds to do in a live setting. It would also allow you to gradually slow down the BPM as you performed rather than jump from 124 bpm to 80bpm in one pattern.

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