I'm trying to do a bit of recording with my sm57 microphone and my Yamaha Audiogram 3. I'm currently trying to record acoustic guitar. so here lies the problem: To get any volume on the db level reader, I have to crank my audiogram's input volume to max. this brings in a lot of unwanted sound (like breathing, my computer's fans, the chair creaking, clocks, etc) so I have a few questions: 1. does my audiogram really have a mic pre like the manual says it does? 2. will getting a mic pre get rid of that extra noise and bring up the volume? 3. why does my behringer mixer (also says it has a mic pre) pretty much do the same thing (low volume, but lots of noise)?