You ever heard how every song that goes on the radio (no matter what style of music) sounds consistant with one another - depite the fact that one may have more bass than another or more highs than another? Ever heard the same consistancy on particual CD's that you purchased at the store? After you've mastered all you tracks follow everything that previous posters said, then apply very, light multiband compression and a light limiting to all songs 1 by 1 (using Waves LinMB compressor and L2, both part of the waves Masters Bundle is the best way to go). Then make adjustments as needed for certain tracks, and you'll hear from that point on they will all be loud and sound consistant with one another. If you're working on a PC, a good program to use is Wavelab. Let me know if this method works out for you.
-DJ Spinn-
