I have been searching for the past two days for a way to get a sound card that will output 5.1 through optical because my motherboard is missing one. I have narrowed it down to Asus Xonar DGX to a cheep good sounding card to get for 5.1. But I am confused at this part because it has optical, says 5.1 sound, but is virtual? Is there another card that will indeed do true 5.1 surround sound through optical to my home theater system?