A. I try to remember to use Edit-MIDI-Rechannel Track (or close)
The Classic window is handy, but it's still possible to not get the MIDI channel saved for a track if you 'force' it in RB. Best to manually write the data to the new channel so all other software sees it that way. You'll see it in the Event List this way.

B. Mixer moves:
I often use the Edit-MIDI-Fill command to move a volume from one setting to another. This makes a smooth change and again hard writes it in a standard format most other software will be respond to. Again you'll see it in the Event List for the track, so it's rght there.
If I recall, mixer moves may be written to different tracks than the track you are moving the slider for in real-time. This has benefits and drawbacks.

I really don't save as MIDI format very much anymore, so these are just things I remember, more than use daily.

I do not work here, but the benefits are still awesome
Make your sound your own!