I recently imported a whole bunch of MP3s that I've already grouped into a single album, but the ID3 tags for track numbers are all blank. How can I tell iTunes to auto-add track numbers in the order they just happen to be in in iTunes? The actual order of the MP3s isn't essential, but I like to keep every MP3 in my library properly labelled.
iTunes doesn't offer this functionality natively: Doug's AppleScripts for iTunes always comes in handy in these situations. In this case, however, there's no easy solution, because there is no script that does that. You would need a combination of three scripts, which should work and should be fairly easy as soon as you have installed all three of them:
As far as I can tell this is the easiest way to accomplish that. Of course you could also write your own AppleScript which does it in one step. And don't forget to create a backup, just in case.