Recording gzdoom with Apowersoft Screen Recording Suite

I have recently purchased this recording suite; http://www.apowersoft.com/screen-recorder.html.

It does a fantastic job, however, it has issues with recording doom. Which is just my luck, because I bought it specifically for that purpose. The sound will not record, I did manage to get it to work once, but I don't remember how. I think it may have something to do with the sound output.

This software records system sounds; it does everything else with out a problem. Like I said, I got it working for doom once before, so it is possible. Has anyone ever worked with this software before, or perhaps know of a solution?