[OT] 4-channel MP3/CD-audio?

[Mike Hicks <hick0088@tc.umn.edu>]

After seeing the recent post that showed a couple of the flags available
for CD audio (DATA, 4_CHANNEL, COPY_PERMITTED, PRE_EMPHASIS), I began
wondering about 4-channel audio.  Has anyone ever come across a CD that
actually has 4-channel audio?  I'm kind of guessing that radio stations
at least occasionally broadcast 4-channel audio, but then I'm not
sure..  That would make sense, since a lot of people listen in their
cars, but I don't know if FM can even do 4 channels.

Anyway, if I ever actually came across a CD with 4-channel audio, would
I be able to play back a ripped track through anything I have?  Could I
make an MP3 out of that and play it back ? (well, provided I actually
had a card that did 4-channel audio ;-)

Just some random questions..
-- 
 _  _  _  _ _  ___    _ _  _  ___ _ _  __   Barium: what you do with 
/ \/ \(_)| ' // ._\  / - \(_)/ ./| ' /(__   dead chemists. 
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 [ Mike Hicks | http://umn.edu/~hick0088/ | mailto:hick0088@umn.edu ]