I'm trying to decide between a PreSonus Firebox or Inspire as my interface for my fledgling DAW. One thing I can't figure out is if either could double as a standalone mic preamp that I could hook up to my Iriver IFP 895. I know there are more practical/portable preamps for this purpose, but it will be awhile before I can justify another purchase. I know the inspire has no external volume controls, but I was wondering if it would still put out an unadjustable signal. The firebox seems like a better bet - is it possible to plug it in to the AC and use it as a standalone mic preamp?