USB port isn't a sound port on the VS. You could use the monitor out on the VS and plug it into the mic input on your computer. That should work. But first make sure the volume is all the way down and just gradually bring it up as music is playing, so you will get the right levels without blowing your mic input on your computer.
Remember that the Scarlett Focusrite is only about a hundred dollars and works just fine as an interface, but only 2 inputs for their cheapest interface.
My wife just left me. Probably because I'm so insecure... Wait, she's back. She just went for a coffee, my bad...