Sorry I didn't respond earlier. Don't check messages on my profile a whole lot as you can see. Did you get this issue resolved? I upgraded my HU to one that had the USB and AUX front ports for iPod control and compatible with the Aeware remotes. Also has 3 4V pre-outs. I'm sure there is a cable you can purchase but don't know the part# off-hand.
I have an '07 outback as well. Do you know if there is any way to hook up an ipod to the stock stereo? I looked for an RCA input on the back but couldn't find anything. I have the Aeware remote by the driver and on the back of the hull so I'm afraid of buying a new stereo that may not be compatible.