>   I am interested in exploring 3d sound, either binaurally or by using 
> four 
> speakers.  If anyone knows of a good source for information on these 
>
> subjects, I would apreciate the help.
> 
>   I am currently running csound on SGI Indigo2 running IRIX5.3. if 
> that helps.
>  
> Thanx,  John Beahan
>         

John,

My bet goes to Ambisonics (try this:
http://www.york.ac.uk/inst/mustech/3d_audio/ambison.html)
They even have some .ORC and .SCO files for Ambisonic techniques. 
Although not well known, Ambisonics is excellent.

	Jason


email:   jhclouse@juno.com