So I had a customers RS4 cabby up today for an SDS upgrade, as most of you know with the RS4 flat bottomed wheel there is no PTT button to use with the bluetooth kit or the RNS-E for voice commands. So after installing a CANGATE and a "SPORT" button into the dash, some simple rewiring of the Bluetooth mic and coding the SDS kicked into life. Here are some pics... Sport button in the dash (or speech button) Flat bottomed wheel (two sport buttons?) SDS of the radio system The "S" button is illuminated as well.