Media box help ! S3 noob here..

Coincidently I have a similar issue, although I'm now looking to swap the full unit out.

Same model/same year car but I have the standard Audi Symphony with 6 disc changer and iPod doc in the glove box, plus what looks to be an antique phone mount in the arm rest. No visible AMI though.

I have been told to use a Dension 500 - Link below. Apparently this will allow me to connect my iPhone via Bluetooth and stream music as well as continue to use the Bluetooth phone function and it will be fully linked to the steering wheel controls.

They have a compatibility chart on the website so you should be able to check your unit is supported.

http://www.dension.com/products/car-multimedia-solutions/gateway-500s-bt

Cheers