Hi All, I'm doing reading and research and it seems that for podcasting/screencasting one can go with either a USB mic, or a "standard" mic that plugs into a mixer. Do programs such as Garage Band, Logic and Audition replace the mixer? What would be the advantage (or disadvantage) of recording directly into one of these programs with a USB mic, vs doing the same thing with a standard mic, a mixer, and compressor/gate? Is a quality USB mic all one needs for podcasting and screencasting? Thank you !