I've got a Xonar 2 soundcard which has both SPDIF and analogue outputs, is it possible to tell 7 to play the same audio through both outputs? (it will split out communications).
It could be possible from Windows' point of view since quite a few hardware cards have independent hardware outputs.
However, this particular behavior can be obtained only with manufacturer's driver.
P.S. Since Windows 7 is technically capable of doing this, there may be some program that can create two separate audio streams from single source...