The animation speed slider does not (as far as I know) automatically adjust for tempo of the imported midi file. I like having a correlation between the speed of animated notes moving and the tempo of the music (faster animation when faster tempo, and vice versa).
Usually this is not a problem, as I can manually adjust the slider to the speed I need. However when the music has tempo changes in the middle, I can accommodate only one of the tempos (the animation speed does not seem to accept timestamp-based changes unlike the color). Is there any way to make the animation speed change in the middle of the video (aside from creating 2 separate videos)?
I’m sorry, that’s not possible or planned as a feature at this time. You would need to make two different videos for that effect.