If you use the headphones from the Audigy now, that will work for hearing what you are recording.

In the Audigy mixer, make sure the Line In slider is up on the playback mixer as well as the record mixer ...

Running the line out back to the 802 is where you will start to make things more complicated.

You would have to switch the cables that currently connect to the main output of the 802 over to connecting to the AUX Send jacks of the 802. Then whatever channel on the mixer you are recording; use the trim and slider to adjust for a good level AND then use the AUX send dial to adjust the signal being sent to the soundcard to get recorded.

Then connect the line out of the Audigy to one of the stereo input channels (you'll need a "Y" cable to split left/right) of the 802 and NEVER adjust the AUX Send dial for that one channel above zero, as you will be creating a feedback loop by sending the signal from the Audigy back to the mixer and back to the audigy and back to the mixer etc. Just use the trim and slider to adjust the listening volume from the soundcard, but leave Aux send at zero on that one channel.

Now you could use the headphone jack on the 802 instead, or connect speakers to the main outs of the 802.

As I said, it gets more complicated this way.

I do not work here, but the benefits are still awesome
Make your sound your own!