<p>Choose 4 when the song is finished, the song will be removed from the "Live" panel.</p>
<p>Choose 5 to temporarily blank the screen, i.e. perhaps an instrumental section in the song. Clicking it again will restore the lyrics to the screen. I also use this button if I want to start the next song at a specific verse. You can blank the song, go live on the next song (which will still be blanked), select the relevant verse, and then unblank.</p>