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I figured out how to find why MythTV sound wasn't working.

 On occasion, I would try to watch a recording on MythTV and there would 
be no sound.  Rebooting would fix it, but I ain't no Windows user, so I 
wanted to find out the smallest thing I could do to diagnose and fix the 

My first guess was that some program was holding open some /dev file.  A 
little poking around with the output of lsof (list open files) showed 
firefox had /dev/snd/pcmC0D0p opened up twice. 
/me shakes fist in fury 

After killing firefox, sound worked again in MythTV. 

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