I found the download for aacgain on the rarewares website and now I am wondering if it's a BAD IDEA to use it.
From the "readme" file, quoted below, you can see it stated that the music files will be changed and the changes are not completely reversable.
That sounds like a bad idea to me. Especially as I am trying to use lossless music files. Surely your lossless music files should never change.
I appreciate comments and opinions from the experts!
USAGE NOTES
1. BACK UP YOUR MUSIC FILES BEFORE USING AACGAIN! UNLIKE MP3GAIN, AACGAIN IS
NOT COMPLETELY REVERSABLE. THE UNDO OPTION IS INTENDED TO RESTORE A MUSIC
FILE TO BE FUNCTIONALLY EQUIVALENT TO ITS ORIGINAL STATE, BUT IT WILL NOT
BE BIT-FOR-BIT IDENTICAL TO THE ORIGINAL FILE. IT IS POSSIBLE FOR APPLE
TO CHANGE THE ITUNES MUSIC FILE FORMAT IN WAYS THAT ARE INCOMPATIBLE
WITH AACGAIN, RESULTING TO CORRUPTED MUSIC FILES THAT CANNOT BE RESTORED
TO THEIR ORIGINAL STATE. I AM NOT RESPONSIBLE FOR DAMAGED FILES.