This link,
http://discussions.apple.com/message.jspa?messageID=1572970#1572970, documents a problem that quite a few people have had with the volume since 6.0.1.
1. Try unchecking "Soundcheck" in the preferences menu
2. Use iVolume or MP3Gain to change and normalize the volumes for all of your files.
3. If you are using an iPod, and you are not worried about your hearing, try a program like GoPod (
http://gopod.free-go.net/)
4. You could always downgrade to an earlier version of iTunes (be careful, you have to completely uninstall Itunes and Quicktime files [including their file folders]. Downgrades are at
http://filehippo.com/download_itunes/.
I hope that some this will help. As you can see, a lot of fooling around to achieve something that was standard a few months ago. I used to go around recommending this program to others, but that is something that I don't do anymore.
Toshiba Satelite A-10 Windows XP Wireless streaming through Airport Express
Toshiba Satelite A-10 Windows XP