All you Audi A4 B7 with Concert 2 stereo's! I have the answer to switching to CD changer on your stereo if you haven't yet worked it out for yourself. As I needed this for my 56 plate A4 with the Concert 2 stereo for the AUX in adapter for my iPhone and iPod: http://cgi.ebay.co.uk/MP3-iPod-DVD-A...item3cb27874a8 All you need to do is hold down the 'CD' button before turning on the stereo Hope this helps a few frustrated people as I know it made me happy once I worked it out! Antz