majalan

Copperbox revision 3034.

I've added a new note list fragment builder (Legato) that improves on Advance.

Although Advance is conceptually fairly simple, it is not so musically useful. Because it places events end-to-end it cannot account for staccato phrases - notes sounding for shorter than their notated durations - and legato / sostenuto phrases - notes sustained for longer than their notated duration. Despite being called Legato (for want of a name) the new fragment builder enables both.