gnome-control-center/panels/keyboard/00-multimedia.xml.in

<?xml version="1.0" encoding="UTF-8" ?>
<KeyListEntries group="system" schema="org.gnome.settings-daemon.plugins.media-keys" name="Sound and Media">

	<KeyListEntry name="volume-mute" description="Volume mute/unmute"/>

	<KeyListEntry name="volume-down" description="Volume down"/>

	<KeyListEntry name="volume-up" description="Volume up"/>

	<KeyListEntry name="mic-mute" description="Microphone mute/unmute"/>

	<KeyListEntry name="media" description="Launch media player"/>

	<KeyListEntry name="play" description="Play (or play/pause)"/>

	<KeyListEntry name="pause" description="Pause playback"/>

	<KeyListEntry name="stop" description="Stop playback"/>

	<KeyListEntry name="previous" description="Previous track"/>

	<KeyListEntry name="next" description="Next track"/>

	<KeyListEntry name="eject" description="Eject"/>

</KeyListEntries>