Stan,

Audacity has a "normalize" function that will boost or cut the level of a selection of audio files so that all the peaks will be the same level. It will process an unlimited number of files (limited only by your computer's processing capabilities).

The challenge lies in the fact that some digital audio files are heavily compressed, so that the peaks will be the same from file to file, but perceived sound volume will vary greatly depending on the degree of compression.

My suggestion: use Audacity, or your favourite audio editor, to get each of your backing track files leveled, EQed and compressed to suit your ear - one file at a time.


just looking for clues...
Oren.
http://www.masteringmatters.com