well if this is the case and the DockConnector2Aux works, there is no difference between any device that has AUX. The only question that remains would be that... how to trick AppRadio into thinking that ipod is connected. I Have appradio 2 but had appradio1 a while ago and the concept is the same as it has two input to the radio from the ipod/iphone.
dannyz3343, the reason the adapter worked intermittently was that when you connect the ipod to appradio, appradio will switch to ipod mode and then when you connect the adapter it just receive the audio from the cable. Now my question is what kind of adapter you used?