When on a Skype video call, I can't seem to change the audio volume. The volume rocker switches don't seem to have any effect. And clicking on the little down arrow when the volume slider is open, to reveal the other volume sliders such as Media and System, doesn't help either. I've tried changing all of those and none seems to have any effect on the call volume. I also can't seem to find any volume controls in Skype itself. Anyone have any other ideas? Thanks. Eric S.