I don't have an mp3 player hooked up, so I can't answer that directly. It does show cd text on the screen. I have an Ipod, but don't have it hooked up yet so I'm not sure aboutwhat the screen will or won't show when it is connected.
I think there is another piece you need. I'm not sure what the part number is but I beleive there is a box you get that allows you do add more stuff to the Ai-Net bus.
There is probably an installer online somewhere that has this info.