I'm trying to add the bluetooth prep to the RNS-LOW The phone works ok, but no sound through the speakers, I'm guessing that the soft coding needs to be changed to support telephone and enable the TEL+/- inputs. But I can't find any soft coding information anywhere. The car is a 2007 A4 with RNS-LOW, BOSE, MFSW & CD changer The soft coding is 0015097 From what I have guessed, the 9=BOSE?, the 7=MFSW&CD changer, these are based on the RNS-E HIGH codings. But everything else is a mystery. Anyone help?