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The selected device has no output controls (OS X)
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Q: On my Mac running OS X, it displays "The selected device has no output controls" when I select my M-Audio device for output from System Preferences>Sound; is this normal?

A: Yes.  M-Audio devices bypass the Core Audio kernel mixer; depending on which M-Audio device you have, output level may be controlled from the M-Audio control panel, the device it self, or the software you are using.