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I am trying to use MOC on Mac OS X (10.6.6). I have installed it via MacPorts and it gives me the following error (with the -D option)

Running the server...
Trying JACK...

FATAL_ERROR: No valid sound driver


FATAL_ERROR: Server exited

(I didn't post all the stuff that worked. I will if it is needed, though.)

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up vote 0 down vote accepted

Installing MOC with vorbis solved the problem. To install it with vorbis via MacPorts, do the following command:

sudo port install moc +vorbis
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