ditto
i've been studying the art of mastering for the last little while and i agree with bruce. most D.A.W.s have onboard mastering tools but it usually just a once page plug-in equipped with eq, compression,limiting etc. but the process is much more complex, involving very high end equippment, usually set up in pairs (it's a stereo thing) and calibrated to exacting specs. Most people don't even realize that most fade-outs at the end of tracks are done at the mastering house. HITMAN.