5.5.2 Current MP3

The list on the right of the `Playlists' tab shows the contents of the selected playlist. The MP3 to be played next from that playlist will be highlight in grey (not the one currently being played). You can double-click on any of those MP3s to set that one to be the next played.

If all of the MP3s in that playlist have been played none of them will be in grey. As soon as you add an MP3 to the list that one will become grey because it will be played next.