@herba, try making a PLAYLIST of your files (an .m3u file), and adding that to calibre instead.
If I've done things right, then it will only add the .m3u file to the calibre library and leave your actual .mp3 files in your original location. It should extract metadata from all files in your playlist to decorate the playlist file in calibre.
CAVEATS:
* don't ever move the audio files. (or delete them)
* don't point your playlist to audio files that might disappear out of your control.
* don't point your playlist to live audio streams.
The plug-in needs to scan the audio file to get metadata information. A stream (of, say, radio) goes forever, and that isn't too useful.
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