Hmmmm .... You've given me a lot to thing about there. I'm not at home right now, so can't try playing with the files until this evening. I can, however, comment on items you asked me to clarify.
These are all mp3 files. Each one DOES contain two types of tags: ID3 and APE. The APE tags were created by mp3gain to store "undo" information from mp3gain track analysis.
Originally, each file contained a few lines in the COMMENT field of the ID3 tag. I seemingly cleared all these comments by the method described earlier.
Now, when I examine one of these files in Mp3tag, the COMMENT field appears to be blank, as expected. When I load it into MusicBee, XMPlay, or some other mp3 player, then ask to see its "Properties," I still see the original commentary in the COMMENT field.
As you suggest, perhaps the original comments were written to more than one field, either within one tag (such as ID3) or across two tags. I guess I have more digging to do. I'll have to make sure I examine both the ID3 and the APE tags when I get a chance this evening. I did not create these mp3 files, so I do not know how much tag info may be squirreled away in there.
On the other hand, perhaps my idea of using the DELETE key to clear the tag field does not really clear the tag field, but simply makes it look empty as far as Mp3tag is concerned. I'll have to experiment with using the option. As noted earlier, I am presented with only two dropdown choices: and .
Thanks much for making time to comment. Every bit of education helps.