I've been having this issue for almost a month now and I'm getting a little pissed. I don't know if I'm the only one encountering this issue or not. Whenever I try and change the volume of my headphones with the 7.1 (surround sound) audio device it stays the same volume. It doesn't make sense to me, even if I try and mute it it's the same volume unless I change it by switching to my main headphone device, which is a USB Sound Card adaptor for my Razer Kraken X. And in case you're wondering, it occurs the same way if I connect my headphones directly into the PC as well. If you can help me I'll be impressed and flattered, thank you!