[Openal] How to record resulting 3-D audio?

[Nate Foreman]

I'm working on 3-D spacial audio application that takes input data from 
several microphones located around a virtual listener, combines the 
sources together, and then streams the resulting audio over a socket to 
a remote client to be played, near real-time, on headphones.

I'm a Nube to OpenAl, and I was wondering if it's possible to "capture" 
the resulting audio (from the combined sources), rather than playing it 
on the default device (i.e. speakers)?

I noticed that there's capture-related stuff in the OpenAl API, but it 
seems to be geared toward microphone input devices.  Is this what I 
should use to record the resulting 3-D audio that normally gets played 
on the system' speakers?