I have a small home studio just learning the recording end. I play guitar and sing but limited in this area, mostly record acoustic and/or classic rock. I have the following equipment and was wondering what to buy next. Mac Pro Quad running Pro Tools LE Digi 002 rack Mackie 824 Monitors AT 4050 Mic Shure SM57 Mic Two Samson C02 Condenser Mics Would be curious of what others think I should get next. Someone mentioned to me a mic pre amp, I'm limited on my knowledge of equipment. What benefits would I get from a mic pre amp, what else should I get? Thanks!