Right, I am trying to record an acoustic guitar through a Shure SM57, which is then plugged into my eMac's line-in jack. The guitar is quite faint, butr what is more annoying is the way the fan noise overwhelms the recording. I am thinking about buying a preamp - WHilst this will solve my faint guitar problem, will it be any use in helping to fade out the fan noise? I have tried fiddling with the effect setting to get rid of the noise, but with little success. My room is quite small, which doesn't help, either. Will a preamp be worth it?