when doing a film score:
lets say you want a 6 bar theme to come in at 1:06:21 when the planet explodes - it is at 82 BPM
and you want a 12-bar theme at 1:10:14 which you need at 120 BPM
you need to use timebase time for tempo markers in this case - otherwise changing the tempo of your first cue will change the location of your second cue.
this is also the use case for partial measures, so that you can change the tempo between the markers without limtation
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