Contact Ken Ball at Audio Line Out and get a decent iPod dock-RCA cable. You don't want to tap off the headphone socket, so forget mini-plug to RCA cords. I started with a SendStation because these are pretty cheap, but a custom dock cable is the way to go. Ken removes all the pins except for the three that you need for auio line level, and uses good wire (Jena Labs) and plugs.
Regards,
Regards,