Questions about RNS-E Retrofit

I recently brought an A4 Cab 2008 and wanted a Sat Nav, I brought an RNS-E from ebay (Q model) and fitted it in the car, pretty straight forward job with help from Utube to take the glove box out.

I took it to a Audi Specialist to have it VAGCOM'ed and the Cruise fitted at the same time but the guy couldn't see the RNS-E, he also tried a borrowed Audi 5150 unit.

The RNS-E all works except for one annoying issue, intermittantly when playing MP3's all the speakers go right down in volume and then back up again etc which keeps happening.

I looked on Google and found out the reason the VAGCOM won't see it is because I didn't move the K-Line wire. It says move it from a the Green Plug (C7) to the Blue plug (B5). I took the unit back out but I don't have a Blue plug, I have a Green at the bottom and then a Black and Brown at the top with a double aerial plug.

I replaced a Concert 2plus with the RNS-E in case you need to know......

So any advice would be useful as I would like it set up correctly with the VAGCOM and I would like to resolve the sound issue ....

Thanks in Advance

S8craig,

Thanks for the response as you can tell I am really new to all this so excuse me if I say something stupid. So I need to buy the buy plug even if I dont want a ipod or CD Changer and move the K-Line wire (C7) to the B5 on the blue plug is that right