3 - Implement parsing of sysexes chopped into several "packets".
5 - Rework removal of tempo changes. Right now there is one scenario that is broken - when
6 you have two tempo-related events at the end of the song (i.e. there are no events following),
7 removing one of these tempo-related events will remove both tempo changes.
9 - Add a way to force some particular tempo during playback and ignore the following tempo changes.