Cannot Record Separate Audio Sources

[Gingervitas]

So I have watched every tutorial I can find on this but no matter what I do, I cannot get this to work for me.
I set my speakers (a.k.a. my headset as they are plugged into the jack) as one source and the microphone
on said headset as the second source. What I would expect to happen is that I would get my game sound as
well as my mic input.

What I get is dual voice audio on top of the game audio. What I think is happening is it is recording my voice
as it is also played through the speakers (a.k.a. headset). How do I prevent that from happening?