I believe the help file and otherwise the forum has more information.

What I know is that it checks in difference between ID3v1 and ID3v2.

As for a better per file identification of what type of unsynchronization exists, this has been requested.

My tags setting is set for v2 tags only.

MMs display of unsynchronised tags could do with a bit more information. While checking last night, I had a lot of unsynchronised tags, although some details were highlighted, examination of MM details against tags didn't seem to indicate any difference. Thought I would try synchronising one file to see what happened. Well I couldnt see any real change in the file except that MM had changed the track of tracks from 18 of 20 to 18 of 0.

so...
1) is there some way of of indicating what differences MM wants to synchronise (or is it there but I am looking in the wrong place?).

2) why is MM changing the number of tracks information, especially clearing it when it (presumably) has nothing better to put in its place.

Otherwise, keep up the good work

Alan