Got a Symphony (I ? - 6CD + cassette) stereo in my (soon to be received) 06 A3 and wondered if I can connect up an Aux in socket via the multiplug. Has anyone done this or got a pin-out of the multiplug ? - or is it only available on the Symphony II ?

If you can do it I take it the head unit must sense when there's something connected and automatically switch to it cos I'm not aware of a switch to go from CD/cassette/radio/Aux In ?