How can I access 3D sound data?

How can I access the sound data from OpenAL after all appropriate 3D
positioning and environment effects have been applied to it?

I would like to access the data for two reasons:

1.) Save the data to a wav file.
2.) Display a graphical representation of the FFT of the data while playing
it.

If this is not possible to do in general, in my case I can guarantee that
the sound will only ever be played in fixed size chunks. Does that change
things?

Is there any way to get at the sound data after it has been processed?  If
not, I'd be willing to try and implement this feature if someone more
knowledgeable could give me a few suggestions about how to start.

sincerely,
--Robert McIntyre

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