i am using a delta 1010 interface with vegas pro multitrack software and soungforge 4.5 sound editor. instead of having my final product mastered. i start thinking about this when i start the recording. the most important part of a rock mix is the drums. working in the digital domain makes controling them much easier.what i do is record click tracks for all the songs first, which i can visually look at each beat of the click in a track file . now i play the drums not worrying if i am perfectly in time, then i record 1 beat of every drum and cymb.Ithen paste these in place of the originals.in time with the click track.now every beat of the snare or bass or whatever are exactally the same timbre and level,thus get this mix right on one song and duplicate this mix on the rest. next set up abass guitar sound you like and even if it takes 2 months do not change these setings or record any thing else untill the bass is done. now all the bass parts are the same in timbre and level. the guitar is diferent because you may want a different sound on each song but you can still controll the levels the same. Its the same with vocals, set it up and don't change the level untill you're done. these are the things that mastering fixes . this may not be as good as the real thing but you'll find you have a much better outcome. Happy recording.