What we're talking about here is binaural. Binaural works amazingly
well, and is relatively easy. The mics should be omnidirectional. And
although they don't have to be expensive microphones, they do need to be
very well matched. That usually means not cheap. There is a fair amount
of literature on the subject, but it takes some digging. Check for books
on microphone technique. Also periodicals, especially Journal of the
Audio Engineering Society (probably older issues), and those that cater
to higher end hobbyists, such as Sterophile.

About 12 or 14 years ago, Edward Tatnall Canby had a series of columns
in Audio (Magazine) about binaural. He described a system using 2
omnidirectional mics spaced about head width apart, with a barrier in
between: a head sized (though not necessarily head shaped) piece of
metal or even cardboard. I believe I would put something soft, fuzzy,
absorbent and about 2-3 cm thick (such as cotton or open cell foam) to
each side to prevent reflections from the barrier causing phase
cancellation at higher frequencies.

One problem with binaural: it only works for headphone playback. On
speakers it just sounds like weird mono.

Have fun.

-David.
> -----Original Message-----
> From:	Greenwood_apel-os, Karl [SMTP:Karl.Greenwood@apel-os.co.uk]
> Sent:	March 23, 1998 12:42
> To:	C Sound Mailing List
> Subject:	RE: two mics -> hrtf -> .wav file?
> 
> > is it possible to have csound process the sound such that when its
> played 
> back on
> > headphones it sounds 3D?
> 
> I believe shadows caused by the shape of the head/body features in 
> this...try placing microphones in the ears of a shop display dummy and
> 
> re-record the sound, this could be simulated in software (i think
> roland do 
> a stomp-box for this effect)
> 
> Karl