So I recently got the Astro A40, and I was really excited. Sound quality is great, the mixamp has great build quality. I'm talking about the 2013 edition, where the mixamp does NOT have a battery pack. The power button's on top instead of the bottom like the old one. I have it connected to my PC with USB and Optical output, but for the life of me I can't get the mixamp to stream the Optical audio. The reason I want Optical is because I want surround sound, even if it's simulated. I have the Creative Soundblaster XiFi MB 3 audio software, with a Gigabyte GA Z97X Gaming 7 motherboard. Also, the equalizer presets seem to do nothing at all. Please help me out here. What am I doing wrong? I even set my output to Optical on my Playback devices, but that played nothing through my Astro A40. The Optical input just WON'T work. If I disconnect the Optical cable, the sound keeps playing, which means the audio is coming from USB. How do I make it so that it comes from the Optical so I can actually use the surround sound feature on my mixamp? Thanks.