XBMC Dual Audio Output
http://forum.xbmc.org/showthread.php?tid=86038&pid=1537846#pid1537846
Change XBMC’s audio output via HDMI-CEC
http://forum.xbmc.org/showthread.php?tid=167914
Configuring audio hardware settings using JSON
http://forum.xbmc.org/showthread.php?tid=169101&pid=1464236#pid1464236
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