"What you hear" - Audio Capture

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"What you hear" - Audio Capture
I am trying to record streaming sound that is being played through the speakers (surface pro). If using the program, audacity, they'll call it recording, "what you hear" or "Stereo mix". Unfortunately it appears the audio driver does not have those api's or at least does not expose them to apps. (or I am doing something wrong)

I have scanned the app store for other recording apps, but the one's I've found record the mic not stuff that is being streamed.

If you have recorded streaming audio on your surface pro, please let me know what you did.

Thanks!