[GnomeMeeting-list] On sound codecs

[JCA <1 41421 gmail com>]

   I am running GM 1.2.1, and have two questions:

  1) What is one supposed to do with all the sound codecs in the
preferences? Why would I want to use a given codec, rather than
another?

  2) In the past, I have been able to test against the voxgratia robot
with some success. All of a sudden, however, whenever I start a
connection to it GM prints out the following message:

    Could not open audio channel for audio transmission

  I have used the lsof command to check out /dev/dsp, and nobody seems
to be using it.
What is going on? My sound board is working fine - as is most
gallingly illustrated by the fact that skype still works flawlessly.