I was thinking about getting the 7301 due to the 5volt prouts. Here is my question...I know it has auxin which will hook up a MP3 correct? So...is this as good as the ipod interface of Alpine, Pioneer, and Kenwood? Aside from using the HU as navigation...mainly I am asking about sound. I was told the ipod would be digital or cd quality where as the aux would be analog...is this correct?