embedded device

Hello guys, i have a noob question about the mic pin of this radio (in general). I am new in this world, and i don't know if i can deploy an audio file in this pin. This is my situation: I am looking to connect a computer to this radio: jack (computer) to RJ45 or DB25 (if it's possible). I am...

I tried searching for this, because I thought someone must have done it before, but alas no luck. In looking to reduce total space required to operate a computer that does nothing but stream audio to the RR servers, I remembered the SheevaPlug that was announced a ways back. While some people...