[PD] multichannel (8) surround matrix

[Phillip Stearns]

Similar to the ambisonics questions, I'm wondering if
anyone has done any work on an 8 channel surround
patch.  I'm looking for something that works in a
polar coordinate system.  The idea is that a sound is
distributed amongst speakers based on it's angle, and
distance from the center of the speaker arrangement. 
This is not simply a pan 360 degrees around 8
channels.  That's easy.  This is more like
spatializing an object inside a space by giving an
angle (0 for front of the room) and radius (0 for
center an 1 for edge of speaker perimeter).  The
ability to specify the amount of speakers for use with
other listening environments is also a requirement.  

Any ides on where to start?  Right now I assume that
all speakers are distributed evenly around a circular
perimeter.  I'm using a cosine panning law for panning
around a perimeter but am lost on how to best go about
spatializing inside the perimeter.  If anyone is
willing to offer up a patch I could tinker with, I'd
really appreciate it.

Thanks,
Phil

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