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.Notifications; member=GetCapabilities

method return sender=:1.25 -> dest=:1.4 reply_serial=2167

   array [

      string "body"

      string "body-markup"

      string "icon-static"

      string "image/svg+xml"

      string "x-canonical-private-synchronous"

      string "x-canonical-append"

      string "x-canonical-private-icon-only"

      string "x-canonical-truncation"

      string "private-synchronous"

      string "append"

      string "private-icon-only"

      string "truncation"

   ]

method call sender=:1.4 -> dest=:1.25 serial=2168 path=/org/freedesktop/Notifications; interface=org.freedesktop.Notifications; member=Notify

   string "gnome-settings-daemon"

   uint32 0

   string "notification-audio-volume-medium"

   string " "

   string ""

   array [

   ]

   array [

      dict entry(

         string "x-canonical-private-synchronous"

         variant             string "volume"

      )

      dict entry(

         string "value"

         variant             int32 61

       )

   ]

   int32 -1

method return sender=:1.25 -> dest=:1.4 reply_serial=2168

   uint32 0

signal sender=:1.49 -> dest=(null destination) serial=1119 path=/com/canonical/indicator/sound/menu; interface=com.canonical.dbusmenu; member=ItemsPropertiesUpdated

   array [

      struct {

         int32 3

         array [

            dict entry(

               string "x-canonical-ido-volume-level"

               variant                   double 61.5646

            )

         ]

      }

   ]

   array [

   ]

Then amixer set Master 10%+:

signal sender=:1.49 -> dest=(null destination) serial=1116 path=/com/canonical/indicator/sound/menu; interface=com.canonical.dbusmenu; member=ItemsPropertiesUpdated

   array [

      struct {

         int32 3

         array [

            dict entry(

               string "x-canonical-ido-volume-level"

               variant                   double 73.5641

            )

         ]

      }

   ]

   array [

   ]

It seems that Volume up also runs some command that checks capabilities and shows a volume indicator. Where can I call this command directly?