Stereo output in original M$ RGB cable - need help

Hey. I'm looking for a schematic of how to output a stereo in this cable in the picture below.

 

It should already have stereo audio out.

Original Xbox to SCART video cable pinout:



Xbox AVIP Pinout:



NOTE: Pin numbering inconsistency between these two diagrams. The first numbers the top row of the AVIP connector as pins 1-12 and the bottom row as pins 13-24 while the second all the even pins on the top row and the odd pins on the bottom row.

The first diagram's Xbox connector is the second's XBOX AVIP Plug - Back View.

 

Thanks a lot!