You can't just take the front outputs and use an adapter to plug it into a soundcard? You may want to watch keeping the volume down of course. My soundcard has a "line input" that I've plugged my home receiver into, I can't see the Empeg being much different. Be careful of course, if it's spitting out too high a voltage I guess you could hurt something.

The adapter is easily found at an electronics store. It's designed to connect a portable CD player to a stereo, but works in reverse.