some time ago, i saw a very brief mention and use somewhere of a system word 'MISSING', and since then somewhere else i saw some mention of apparently other system words - NOT, MATCH, HAS, IS, AND (i didn't see any OR mentioned, although logically you would think it would be there)
Operators only work in the filter, so that is exactly where they should be.
You are here for this reason. The existing data in your tags was poorly, or at least not consistently, maintained in the past. This is the same reason every other user has landed at mp3tag. It is free for Windows users, and a modest price for native Mac users. But the time saved using it is invaluable. Most seem to appreciate what mp3tag has to offer, a few can’t seem to grasp how it works and blame the universe.
Perhaps you are expecting far too much from the program, or the other users that have generously responded to your rampant requests to provide you guidance on correcting your own data. I have personally tried to reply where I could add support for you, but I can’t believe how ignorant most of your replies have been when you couldn’t get the desired results.
I’m sorry, but my time is valuable to me. I won’t be replying any further to your comments here.