I'm not very tech savvy and so far posts I've read have me more confused. I want to record my voice as one of the tracks in GarageBand and cannot figure out what specific equipment (microphone, more?) I will need to make that happen. A Logitech USB Desktop mic doesn't seem to do it. I have a brand new Mac with Leopard. If I need to use audio input port on rear of screen, is any specific equipment recommended? Thanks!