Hey, Just ordered a Gigabyte Gaming 7 Mobo partially because of the audio capabilities. Only thing is, theres so much to it that Im now confused. I can change the "Op-amp"? I have figured that that means the bit you change alters the levels of your audio to your preferred taste. But theres also a switch to change from 2.5 to 6x "Gain boost" for high impedance headphones and speakers. Wanting the best quality sound, what would I use with Sennheiser HD518's and Logitech Z200's? Thanks