AW: adsr and lfo abolish (Don goes off the deep end again)

[Sean Costello]

Geren W. Mortensen, Jr. wrote:
> 
> All that said, what explains our ability to tell not just left-right, but
> up, down, fore and aft positioning of sounds?

The highly frequency specific filtering of the pinnae. A sound from
above will have notches in its spectrum in a far different place than a
sound from below, because the curves of the pinnae will cancel out some
frequencies and emphasize others. This is the principle of HRTF 3-D
audio from stereo speakers. Of course, it helps if your ears are exactly
the same shape as the ears used to make the HRTF measurements.

Sean Costello