I recently purchased an Epiphone Ultra III guitar which came with Guitar Rig 4 software and USB cable to connect to a computer. I connected the cable and experimented with the audio settings and got the guitar talking to the computer (I can see the bar deflection on the dispaly when I strum the guitar), but I can't get any audio from Guitar Rig out of the computer speakers. The speakers work fine with everything else. Anyone have any suggestions?