Hey, I just received an Icemat Siberia headset with USB soundcard. I also have an X-Fi XtremeGamer soundcard. My question is would using the Icemat's USB soundcard render the X-Fi soundcard useless? Will the X-fi soundcard and icemat's usb soundcard both be working? And if it is so that only one or the other will work, which one should I use? thx guys