#788 * Added default value of `0` for volume, when the default output device does not provide one.
#788 * Added default value of `0` for volume, when the default output device does not provide one.

CommandPost/CommandPost,CommandPost/CommandPost,fcpxhacks/fcpxhacks,CommandPost/CommandPost,cailyoung/CommandPost,fcpxhacks/fcpxhacks,cailyoung/CommandPost,cailyoung/CommandPost