Normalizing MP3s

[Dave Sherohman <esper@usinternet.com>]

I'm currently using cdgrab (which in turn is ripping with cdparanoia and
compressing with lame) to transfer CDs to MP3, but I'm running into problems
with CDs being recorded at different levels.  Can anyone suggest a tool which
will normalize all tracks to peak at nn% of maximum volume at some point in
the process?  (One that goes back over an existing MP3 file and normalizes it
would be ideal, but if I have to rerip the tracks to get them normalized,
then so be it.)

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