I have recently purchased a car with a Pioneer SPH-DA160DAB radio and am having difficulty connecting/playing my IPod Classic. I have connected it to the radio via the USB lead that connects to the back of the radio and the IPod has connected to the radio so that I can see the songs listed on the radio screen. The songs are playing however I cannot hear anything. The radio volume is turned up as is the IPod volume and both the IPod and radio work normally. My question is do I need to attach a Aux lead from the IPod to the back of the radio? Any help would be appreciated. Thanks