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How many id3 taggers understand "mp3gain"? Probably none. I doubt wmp does (what most will be using to tag), and I doubt iTunes does (what the rest will). Once you change a tag, any tag, it's a pretty good bet the mp3gain "save" value is gone for good (tags are often rewritten in whole on any change). Now there's no way to undo it, and it's another fine mess you got yourself into.
mp3gain is not a good way to do this. It is A way, but not a good one. And that's not even getting into how valid this guy's "mp3gain" algorithm is (when it is, when not, ...).
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