Mac Pro 2006 Front Panel Audio

[Soup Rice]

Hi, i been working during the holy week on a 2006 case. i have almost everything finished, except the audio. 

 

i have found the pinout for the connector here on this forum

Quote

MACPRO FRONTPANEL AUDIO

1 Sense

 

2 GND

 

3 Left Channel

 

4 Right Channel

 

5 (Cable Shielding) GND.

But im having a hard time to figure where are those suppose to go to on the motherboard.
this is what the motherboard has.

 

So i have no idea where the pins are suppose to go to this header. 
i tried this and it didnt worked at all.

1 SENSE to SENSE1_RETURN
2 GROUND to AGND

3 Left Channel to PORT1 L
4 Right Channel to PORT1 R

5 Cable Shield i left unconnected

 

Any ideas?