As muddy as the vocals are they actually sound much clearer on the recording than they did live. The band didn't do any kind of sound check or anything. There were 3 bands playing starting at 10pm. They all showed up about 9:40pm and put their amps and instruments on the stage, plugged it all in, and started playing. It was as raw as you can get.
As far as amplifying in Audition, I never use normalize. I will usually find where the strongest peaks are in a recording, then look for peaks just below that and use hard limiting to cut the recording to where those second line of peaks are ("limit to -XXdB, raise gain by 0dB) and then raise it to peak at -.10dB. It also depends on what kind of recording it is. For voice only I can push a little more and it usually sounds fine. I don't go too extreme with music.