Not sure if this is well known (we've had a lot of id3 tagger threads), but
Mp3Gain is a really cool freeware app.
Basically it normalizes the volume of your Mp3 collection. Which, if you have a collection like me, really helps.
And, it does this
losslessly. And you can undo the changes.
iTunes has something like this, but with this solution the volume changes are part of the file so they don't go away after a reformat and work on non-iTunes players.
Also it's open source and all that, for you people who are into stuff like that.
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Gamertag: PrimusD | Rock Band DLC | GW:OttW - arrcd | WLD - Thortar
Um, isn't that what this does?
No, it's all in AAC.
It does add replaygain tags, but it also modifies the global gain value, which is part of the MP3 spec and supported by just about everything.
Some are really low and others are at times low and ear rapingly loud in the same podcast.