This is too cool. Aside: what is that neat flash package used to play and display the notation? For example, when you hover over the "1-up melody" notation, ea

This is too cool. Aside: what is that neat flash package used to play and display the notation? For example, when you hover over the "1-up melody" notation, each note plays. Or the "play slow" feature of the "Jump" music's glissando?