What you are wanting to do, however, isn't an exact science. I'd be careful to play around only using back ups until you get the hang of it. It's not just a matter of increasing or decreasing the volume of your tracks.
(edited by Leroy on 16.3.06 1553) "Those of you who think you know everything are annoying to those of us who do." David Brent, The Office
"Oedipus ruined a great sex life by asking too many questions." Stephen Colbert, The Colbert Report
MP3Gain is a quick program that I use to get all of the mp3s I want to burn to be the same volume. It only works with (guess what?) mp3s though.
For all other types of audio editing, I use Goldwave.
edit: I should point out that there are some songs that can throw off MP3Gain. Because it works based on the average volume of your mp3, if a song is quiet for a while, and then gets loud it might make it quieter than you wanted. It's a good idea to test them once real quick after you're done just to make sure. Bohemian Rhapsody is a good example of the type of song I'm talking about. 99% of them turn out fine though.
I use a program called mptrim. Its main purpose (as you might suggest from the name) is to automatically remove blank space from the beginning and end of files. But it also does automatic volume control and fixing incomplete frames.
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I have a Dell Ultrasharp 17" monitor, and my video card is an ATI Radeon 850 XT Platinum Edition. For the past, oh, two days my computer has been acting strange. The brightness of my monitor goes way up (but everything is pretty much readable)