Hi Silversnake,
Your welcome....glad it helped.
UPDATEReading page
104 onwards of your manual it states:
The motherboard provides three audio jacks on the back panel which support 2/4/5.1/7.1 (Note)-channel audio. The picture to the right shows the default audio jack assignments.
This being the case would suggest that these are the default jacks.
It later states:
The integrated HD (High Definition) audio provides jack retasking capability that allows the user to change the function for each jack through the audio driver.
Therefore you may be able to plug into the 3 jacks and change the retasking......as it reads you should be able to retask the pink jack through Realtek HD Audio Manager,
by right clicking on the jack, as it does support 5.1 audio.
Teknology9