What is a good MP3 editor(that can adjust volume)?

I have a few MP3’s that I’d like to burn to a cd. They are all different volumes, however.

What is a simple, free mp3 editor that I can use to adjust this?

Not shareware, though, since I’d like to use it in the future as well.

I use a program called mp3gain, which is freeware, and is really nice. Give it a try.

Most CD burners will normalize for you.