Gee, that's not something I'd dream would be possible. It will be interesting to see responses.
I use Audacity to increase volume on individual files, and Nero Burning Rom to equalize track volume when I'm burning a CD.
How can it be done with a command line or batch file? If it can be done with a command line, it would be a very complicated command to work on multiple files. Seems to me a batch file or a copy-pasted command line would be better.
-Joe-