The sound coming out of UX2 should be dead silent when working properly. When you boot computer, do not have device connected. Make sure nothing else is connected, like a mic or guitar...nothing. Boot comp, plug in UX2...then plug in mic or whatever after you make sure device is working properly. This happens everytime for me if I leave my XLR mic plugged in...noise, static...gargling noises....not sure why....but as long as I boot the device up without the XLR mic plugged in, it works perfectly.