I just bumped into the 240 bpm limitation.
Still messing around to get triplets quadruplets and sextuplets in the same sequence. See the "Triplets triplets triplets!!!" topic.
But using a 48 steps sequence as a 4/4 bar at 240 bpm, the max tempo is in fact 90bpm. Which is pretty sloooooow.
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It's a 3 digit display, thus why not 999 bpm ?!