Glovebox CD Changer Pin diagram

Im in the process of building the adapter cable to add sat radio to my A4, and i have the glovebox cd changer instead of the trunk one (early Canadian B7 A4 dont come prewired)

i have all the connectors and wire terminals that lead in and out of the cd changer, all i need now is to know which pin/wire color does what

here are the pin numbers and the wire color

1- Brown -
2- Red -
3- Green -
4- Yellow -
5- N.C.
6- Blue -
7- Black -
8- Purple -
9- White -
10- Orange -
11- N.C.
12- N.C.

I presume that Brown is ground, Red is Power

so i need to find which one are

ACC POWER
CH DATA
CH CLOCK
R-DATA

AUDIO L
AUDIO R
AUDIO GND

so that i can complete my wiring harness.

thanks a lot

jonathan