Boosting MP3 gain.

Do you play your mp3's through iTunes? I think there's a normalisation (volume balancer) built in which will help with that.

Or, do you wish to generally turn up the gain on audio recordings? This would involve re-encoding, which isn't ideal (loss of quality), but if that's the way you'd want to go either use Garageband, or download Audacity (free, Google for it).
 
Don't use itunes; Vlc for me.

Considered using Audacity already. But want to make sure it is boosted to the same volume as other mp3s I have. It's only a few than needed boosting.
 
You could just normalise your tracks, although you'd lose the dynamic range.

If you're willing to use iTunes it will do this automatically, and wouldn't permanently murder the sound :)
 
You could just normalise your tracks, although you'd lose the dynamic range.

If you're willing to use iTunes it will do this automatically, and wouldn't permanently murder the sound :)

Normalising doesn't lose dynamic range. Normalising works by finding the loudest part of the song, then seeing how far off the 0dB threshold it is. It then applies that percentage of gain across the whole track. This way, dynamic range is preserved.
 
I use mp3 gain http://mp3gain.sourceforge.net/ which normalises tracks to a certain dB level. My whole library (13,000 tracks) has been done using this method and it works great. There is a mac version of it but it does not work in leopard - works fine in tiger though. I use the pc version to in vmware fusion before adding tracks to itunes.

Apparently it alters tags within the file, so it doesn't actually alter the original file in anyway, it tells the mp3 player at what level to play the track.

Like i said, works for me just fine in itunes, VLC, WMP and on an ipod.
 
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