Hi there!
The "stereo" jack is not for audio at all -- rather, it is for a pair
of LCD shutter goggles that work in conjunction with certain monitors
to display a stereoscopic 3D image. This functionality is REALLY
common on higher-end video boards (e.g. SGI, Intergraph, etc), and
apparently was used primarily in computer aided chemistry visualization
and things like that.
I don't have a pair of requisite shutter glasses to try the concept,
but it always seemed kind of chintzy to be used in a high-end setup.
Sort of like a pre-HMD semi-immersive sort of display technology,
although it's still around...
Kind regards,
Sean
--
Sean Caron
http://www.diablonet.net
scaron(a)engin.umich.edu root(a)diablonet.net