Is it possible to capture the raw sound output that Wwise sends to the speakers?

Question

I need to capture the raw sound output that Wwise sends to the speakers to memory.  I am using Wwise in Unity.  I am aware that there is a function 

AkSoundEngine.StartOutputCapture(filename)

​Which captures the sound to a wave file, but I need to capture the raw audio in real-time as either a floating point array or 24-bit PCM array (either is fine).

This needs to be done in real time and in C# as I am using Unity.  This means creating a C++ audio plugin is not an option.

Any help whatsoever will be appreciated.  I've search the SDK and can't find anything.

Best Regards and thanks in anticipation for any help.