My headphone makes really soft but annoying noises when I plug it into the front audio ports, so I put it in the "line in" audio port in the back. (already tried switching the front audio ports/cable to the mobo but didnt work, probably something with the mobo itself) I also have a speaker set plugged into the "line out" port. When both individually plugged in it gives no problems, but when they're plugged in at the same time the sound comes out of both the speakers and headphone at the same time and (i think) that they both are seen as 1 device. I use Realtek HD audio configuration