First, let me say that this app it super great overall, and it allows for some really cool videos. However, there's a few areas where certain things didn't line up completely correctly.
I released this video yesterday, and I noticed that there were a few glitches and jolts with the Saber.
https://www.youtube.com/watch?v=lYW5j5aXCM0
The other thing is that I can only control the color of one MIDI channel when changing it.
Other than that, I found the app extremely nice and useful!
Are you using the very latest version of the app? The saber skipping was an issue that should have been fixed in an update a week or two ago.
Can you clarify a little bit more what you mean about only being able to "control the color of one MIDI channel"? Are you sure that your MIDI file actually has two MIDI channels in it, if you are trying to use the Color By Track color mode?