I came up with a method of synchronizing sound and video using POV by
using the actual spectral dataof the sound file to control various
object parameters using POV 3.1's new text-file commands.  So far my
attempts have been specialized hacks that don't generalize easily, but
you should know that it's possible.
On the looping sound-video synchronization thing, unless the tempo
corresponds precicely to the frame rate you are using, a cyclic
animation will drift versus the beat.  The solutions are:

(1)  change the tempo of the sound source so that it is a multiple of
the frame rate.
(2)  change the frame rate to match the tempo
(3)  render the "loop" as one long sequence, with the tempo matched exactly.

You will be able to see the results of my POV-sound experiments shortly.
 I'll post once those pesky final 2 minutes are filled up.

-Eric

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