Hey
 
I have started a new project, where I inserted a Roland Groovesynth with a MG1 blip as a kick (midi) on a 4/4). I want to use it as a Sidechain for other tracks and buses. It start out good, but after a while some of my kicks disappear, let's say 1, 2, 3, 4, 5, 6, 7, - 9, 10, 11, - etc. very irregular. I don't understand this behavior. There seem to be no reason for it. 
 
If only running the Sidechain kick track it seem ok, however, after connecting other buses or tracks the behavior above happens.
 
Any ideas?
 
I am running Sonar X3c Producer, windows 8.1, 64 bit.

You might want to post in the SONAR X-forum, this one is for <8.5 versions.
Anyways, doubling the MIDI buffer ( "MIDI Buffer... prepare using xxx ms buffers" or something) might help.

Ah, sorry:) Thanks, did miss that