I've always ripped vocal audio snippets off youtube via audacity to use in my tracks. However, since upgrading and building my studio, adding a well needed audio interface (Focusrite Scarlett 2i4) I am baffled at how to record internal audio? for some reason I cant get anything to come through? I mean, I can hear the audio from the tube, and ive checked audacity is set to stereo mix (although I fear this may need to change because of the interface) yet I draw a blank every time. Anyone lend a helping hand on this one?