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How to add 'Volume up, muted' keyboard command?

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http://askubuntu.com – When I change volume using the media keys there is a popping sound notification. Sometimes I'm playing media, and I want to adjust the volume without sound notification. I want to add Volume up, muted -> Shift + Audio raise volume shortcut. How do I do it? Binding Shift + Audio raise volume to amixer set Master 10%+ changes the volume, but doesn't display the visual indicator of volume change. Looking at dbus-monitor shows different events: Stock Volume up: method call sender=:1.4 -> dest=:1.25 serial=2167 path=/org/freedesktop/Notifications; interface=org.freedesktop.Notificatio (HowTos)