I'm sound testing a song of mine I made in GarageBand. On my MacBook, it sounds full -- as loud as a U2 mp3, for example. However, when I play it on my iPod in my car, it's quieter than that U2 mp3. Is this normal? Here's the song in question (fast forward to 1:20 for its loudest peak): http://makeoutmusic.knoxware.org/go...3 (with new vox-near done)-new compressor.mp3 I've turned it up as loud as it can go in Audacity (using Leveller and Amplify).