0: displaying notes in text tab
1: use of exKey
2: using sprites, tab
3: using sprites, clef
4: controls
5: moving timeline
-- in progress --
6: web audio
-- planned --
7: motif operations 1
8: chord progression riffy
9: pageDisplay, multiple lines of sprites
10: pageDisplay, single updating line
11: loading notelists
12: loading notelists