I have just recieved my Dension Gateway 300 for my A3 thats fitted with a Symphony II+ headunit. I have come to fit it and the instructions IMHO are terrible. The Dension cable has a loose black wire in there, what is this supposed to be connected to? Also what should i do with the brown cable in the connector block of the Audi loom that i remove from the head unit to fit the Dension loom? Also do i need to connect my laptop to the Dension gateway to configure it?