Code review comment for lp:~ted/indicator-sound/extreme-volume-warning

FYI, testing in rtm silo 6 yielded a few issues:
- sound played only once (I know Mirco explains this somewhere)
- I still had the sound when playing music, which got paused
- when the notification disappeared, the first subsequent volume button press resulted in an incorrect level notification displayed
- notification displayed and sound played when changing volume through the indicator menu slider
- no warning text displayed, just the bar went orange (when playing music with headphones plugged in)