Astro A40 + Mixamp Pro Optical Audio not working in Windows 8.1

[LifeOfO7623]

Hey all, I'm sure this has been addressed by somebody somewhere but I couldn't find a solution in two hours of browing. I have an Astro A40 + Mixamp Pro plugged into my PC and the optical audio isn't working (meaning no EQ modes or surround sound). The mixamp is plugged into my computer via USB (which is supposed to be for power and voice) and toslink optical. I don't have a sound card and my mobo is an MSI Z97A Gaming 9 ACK. From the Mixamp the audio goes directly into the headset. It sounds good and all but when I unplug the optical cable from the back of the Mixamp nothing happens. All sound appears to be coming through USB. Has anybody run into this before or have any ideas on how to fix it? I'd really like to take advantage of the 7.1 and the EQ modes. Thanks in advance for any feedback and if you have more questions about my system please don't hesitate to ask.

 

[LifeOfO7623]

Never mind, total moron mode. I had the mix amp set all the way to voice and not game so the optical was completely muted. Ooops.