midi file tempo

I've searched for the answer, but can't find anything about it.
I have a midi drum track setup as multiouts in ezdrummer 2. The song varies in tempo throughout the song. Starting at 140 then to 155, 170 and back down. I can't seem to figure out how to change to the different tempos within this one file. There are no other instruments recorded, just the drums.
 
Also, the play back sounds fine, but when I export to wave only the kick is exported. Nothing is muted and sounds play back in Sonar.
 

Regarding export, we don't have all the information to troubleshoot this.  Are some, all, or none of the tracks frozen?
 
Here are some possibilities for the export issue:
- Some tracks are not output to master, or they are output to a bus not selected in your export dialog.
- Some tracks are not frozen, which is fine only if you check "Include Live Input" in the export dialog.  If you don't check that, you will only get rccorded and frozen tracks in audio.
- Some tracks are not selected when you export. I always click on one track and the choose Select All.  If you choose Select All without selecting a track, you may not actually be selecting everything.  This one is tricky.
 
All of these things have happened to me.