the pink is already in use for my headset mic and the green for the speakers in the headset, so it only leaves the blue LINE IN. want to be able to listen to the audio in the headset.
EDIT: i guess this is unclear in my original post. i wish for the sound to be sent to my tower where i use a headset that require both mic and audio jack, but my laptop only has one 3.5mm jack. so i need to use my tower to be able to speak with people. but i does mayority of my stuff on my laptop that is related to sound, and i would like to avoid having to use a phone headset under my normal headset just to be able to do both at the same time