Laszlo Vecsey wrote:
> 
> input. I have two microphones set up in the room, is it possible to have
> csound process the sound such that when its played back on headphones it
> sounds 3D?

Isn't hrtfer meant for placing one signal in the (virtual head) space? 
You wouldn't need two mikes for that. Also I *think* it's too demanding 
to allow real-time processing on a normal home computer.

But recording a good stereo image will often be as realistic as you 
need, and it doesn't have to be hard to do if you have reasonable mikes.
 
> Also, another question.. have you ever noticed that when you record your
> voice and play it back it tends to sound very different. /.../ Could
> csound filter similarly so that the resulting output is the way you hear
> it as you speak?

This effect has two main reasons. 
First, the voice reverberates the whole head. Compare when you put a tuning 
fork to your head, or speak holding your hands over your ears: Sound travels 
very well through the bones. 
Second, the higher frequencies are filtered out from one's own voice. 
High-pitched sound cannot bend around the head so well, so the lower
frequencies dominate in your own voice. 
A similar effect is also present for the skull reverberations (I imagine): 
The high-pitched noisy material in the voice form in the mouth, while the 
low and mid-freq's are much stronger, being the base material which is 
generated in the throat. 

Don't know a fixed recipy for simulating these effects in a recorded sound, 
but try playing around with normal filters. 

Regards,

	re