Hello I recently purchased a Behringer 302USB Xenyx 5 Input Mixer and a AT2020 with an XLR cable off a Amazon, I setup the Behringer Mixer to my computer with the USB, it says power on and I've connected my AT2020 with XLR cable, but whenever i plugin my headphones into the mixer and goto windows and set the mixer as the default Playback device then people can hear my desktop audio through my Microphone on Skype etc.. Does anyone know why or how they can help me?