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the place for useful commands, 1-liners and snippets please leave a short description or some links here
mp3 “normalize” by id3 tag
mp3gain analyses sound files and saves an id3 volume metatag to them. many music-players can read that id3 tag and adjust the volume.
find /path/to/music/ -type f -iname '*.mp3' -print0 | xargs -0 mp3gain -r -k