[samibe]

Interesting idea. It almost works except that the scrolling seems to move the music at a certain rate (it scrolls 5 inches per minute or Y% of screen in X seconds) rather than a percentage of the page per X seconds. So because the duplicate pages (after they are cropped) take up the same screen space as the whole page, the automatic scrolling scrolls through it in the same amount of time as the other pages. 

You did get me thinking though. If I duplicate each page a few times and then crop each duplicate to a single line, then I can set the metronome up with the number of beats per line and have the metronome turn the 'pages'. Using vertical scrolling I can still see three lines (pages) at a time and each time the metronome turns the 'page' it increments the song one line at a time. That seems to work reasonably well.