I'm a very recent new-user of Mp3Tag, and now that I've completed the task that caused me to find and download Mp3Tag, I decided that I should give some feedback.
First, just an overall comment: Mp3Tag seems to be an excellent piece of software, and certainly one of the very best in its class. (And, ditto for its community-forum! I'm a lover of the Stack Exchange family of forums...specifically StackOverflow.)
My feedback #1: The "can't see the forest for the trees" problem:
For context, here's the question that I asked at StackOverflow: How to add cover-art to mp3 file using Mp3tag program - Stack Overflow
As you can see, it wasn't at all obvious to me, that the 'secret' to understanding Mp3Tag's UI is to think: 'RIGHT-click'. So my thought (suggestion) would be to add a FAQ entry (and maybe a "getting started" example) on "Basic use of Mp3Tag", showing/describing how to embed an existing cover-art file into an existing MP3 music file.
[ A related programming suggestion: Each time one iterates thru adding a cover into an MP3 file, it brings up that dialog where one chooses among their existing covers, which one to embed.
It would be very helpful if that dialog REMEMBERED which cover was selected on the previous pass, and positioned the dialog THERE (instead of at the beginning of the list), on the assumption that the user has a short series of songs all from
a single album. That way, the user wouldn't have to scroll thru
a list of, say, 40 album covers, to re-find (scroll) to the same cover-file each time. ]
My feedback #2: Make mention in that FAQ/getting-started-example, about the existence of the "Album Art Downloader"
program, as the best approach to finding any album-art images
that the user doesn't already have! [ In my case, I already had covers that 'Windows Media Player' produced, back when I used its 'track-ripping' feature to acquire MP3's for my tracks-of-interest. But, for about 20% of MP3 file collection, I did not have album-art images, because they were not acquired via track-ripping. [ In my case, I struggled needlessly, google-searching for images of my missing album covers, and then re-sizing them to 200px by 200px, using the image-editor MSPaint. So, today, I plan to download and test-drive "Album Art Downloader", to retrieve the remainder of my missing album art! ]
Cheers...thanks for listening !