Question about "wave out mix"

[JTGOB]

You cannot record internal sources (wave out mix, what u hear, etc)

http://www.digit-life.com/articles2/multimedia/m-audio-revolution51.html

This site says that you cannot "record what you hear" with a Revo 5.1. Is there another way to record the audio that the computer is playing?

If not, then I guess Cam Studio would not work with this card, right?