I do this via audition, however it would be usuful to have the option to do this when adding assets to the library.
Comment on this feature request:
Mark Hawkins commented
Actually rather than "normalise", either some kind of "replay gain" tag or the ability to run the track through a gain adjustment tool without re-encoding.
Jack Doyle commented
Look in the Tools menu for Loudness Analysis. This should be what you're looking for. Leave it on and it will handle any newly added tracks.