User Manual-Mac

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Chapter 9, Using Matrox MXO2 with Supported Programs
¦NoteIf the Output format list is unavailable and “(In use)” appears, the
MXO2 hardware is currently being used by an application on your system. To
change the output format, you must first disable
A/V Output in Final Cut
Pro X (
Window > A/V Output), or close any application that is using
Matrox MXO2.
4 In System Preferences > Sound, set Matrox MXO2 as the Output audio
device for your Mac OS system. Close the
Sound preferences window.