It wouldn't work with albums where the mastering is different, especially if the digital release is compressed more. You cannot undo squashed dynamic range real

It wouldn't work with albums where the mastering is different, especially if the digital release is compressed more. You cannot undo squashed dynamic range really. A famous example from a while ago is the album stadium arcadium by the red hot chili peppers. Comparing the two versions of a song should sound notably different even to a casual listener. And you can really see the difference just looking at the wave forms.