It looks as if the desk has tape ins, on phono. Go there. It also appears to have two non mic-channels - line ins on jack. You could go there.

Or you could use a DI box to get into a mic channel. Is the phantom not switched channel by channel on that desk? If so switch it off on the channels you use for the ipod if you go that route.

On a decent desk, and with decent power amps and speakers you WILL hear the limitations of MP3s!