I have just bough the iq2+ usb mixer and tried to install it on my pc.I followed the quick installation guide step by step but i get no audio on my headphones(didn't have stereo speakers nearby to test).All settings were done at traktor 3 demo that was included in the package but still no sound.Mixer seems to connect fine but it doesn't seem to be properly connected to my pc,although when i plugged both usb cables it said that it was installed and ready to use.Did same connection to a friend's pc but still no sound.What is the problem?