User Interface - Mute / Clear / Blank Buttons

The following are the buttons used mute and clear the screen.

	Mutes the screen so to black so that nothing is showing.
	Clears the foreground text from the screen but leaves the background in place.
	Replace the currently presented media object with the blank slide object.

The Mute and Clear buttons do not replace the currently presented media object. However, if the media object is playable, such as a video, slide show, or audio file, then the media is paused.