fillerup

Hi all. Newbie here. Hooked up GR as described in diagrams.Problem is sound meters bouncing back and forth with nothing trying to be recorded. In fact, if I turn off the receiver and disconnect from the sound card, no difference, meters still jump around. meters stay in the LOW range. Do not have any thing else playing on the computer. No cd's etc. I'm stumped. Any ireas? Thanx in advance