Audi A6 2.0TDI - MMI Basic plus. I want to update the MMI SW version to be compatible with the MP3 6 cd changer. Can someone confirm the correct part number of the MP3 changer? Also do I need to keep the single CD player and add the new changer or can it be stand alone? Will the new new cd changer when installed be in CP? Also with the MMI update does that update the gateway SW version?