pdarg
Hmm . . . no, we're still not on the same page.
-Preferences | Colors did work in X2 for MIDI track background colors [see screen shot below]
-No, I did not migrate from a pre-X version of Sonar
-Yes - changing a series of clips is less than 14 steps - for one track, one time; but multiply that process by many MIDI tracks and many projects . . . well, you see what I mean. I'd rather set the options and not waste hundreds of clicks getting what I already have with X2.
[I don't mean to belabor the point, but this will mean A LOT of adjusting of MIDI tracks in X3]

Well, I'm not sure which "X2" you're using, but in my X2a the colors shown above are there... but do NOT work. You have to scroll further down to "Tracks x, xx, xx... Background" to change them, and then they change ALL track backgrounds.
I am told in X3 you have to use the Inspector "Track" menu to change them individually.