I’m working on a piece in cut time that starts out at tempo of h = 66. Later it calls for poco piu mosso which shows a percentage increase in the property panel of 110% (so slightly faster). But what is happening is it slows down considerably. It’s like it is assuming the original tempo is q = 66 to compute the new relative tempo. If I instead use 220% in the property panel, then the new tempo seems like it is slightly faster as expected.
Alternatively, if I specify q = 132 for the initial tempo and poco piu mosso = 110% then I get a similar result as initial tempo of h = 66 and poco piu mosso = 220%.
So it seems the percentage increase incorrectly assumes the tempo of a quarter note beat not a half note beat.