Hello guys I am wanting to fit a Parrot bluetooth phone kit to my A4, it is fitted with the standard Concert (non-BOSE) stereo unit. Can anyone point me in the direction of a wiring pin-out so I can identify the telephone muting wire into the stereo? I know that the Avant uses an amplifier for the rear speakers so these have a line-out connection, I am intending to wire the Parrot output into the front pair of speakers. Or is there a commercially available adaptor I can buy to allow me to plug in the Parrot? Many Thanks in advance.