Searched, and found nothing particularly relevant... I have a Z130, with the bypass, nothing else modded... I'm trying to play audio from an Ipod classic through USB through the factory iPod USB cord..

I know there's tons of stuff about no video from iPods, but the official usb blah blah. I've set the AV1 input to ipod already, I have control of the iPod through the head unit and album art, VR works, just no audio. Am I required to use a separate aux input for only audio? The reason I ask here instead of trying it is I do not have one, but will get one if I need to. I just don't want to waste my time bothering with it if that's not the problem.

the avic uses the low-level audio outputs from the 30-pin dock connector on the ipod and feeds that to the headunit, so yes you need the Pioneer ipod cable.