Firstly, thanks for the informative posts above. I've recently upgraded my sound system and am in the process of converting my mp3 collection to ALAC. I will end up with a combination of mp3 & ALAC in my collection.
I previously used MP3GAIN to normalize my mp3 collection and was very happy with the results. I've followed the above steps and I'm still finding some variation in volume between ALAC files and I've also found that MP3 files as a group play significantly quieter than ALAC files? Is this normal or have I done something wrong?
When I play files in Foobar, I can hear a definite difference in volume between before and after applying replaygain values, so I assume I've got this process covered. When I play files in I-tunes pre and post MP3TAG application the differance is not noticeable so I suspect I've messed that step up?
I'm using the mta files kindly provided by garym above which I beleive I have properly loaded into mp3tag. When I run the action, I get an information tag saying "Formatted tags in 2 of 2 files. 0 of 2 files remaned" which I assume means what was supposed to happen has happened?
Any thoughts would be appreciated. I hear a definate 5 to 10dB gain between mp3 and ALAC files when played back thru my ipod nano?
ps - I have switched "sound check" on on both itunes and my ipod.
pps - When I am in itunes and I click "get info" on a track, under summary should the Volume indicate 0dB or another value?