Introduce Autoplay mode

[cdauth]

In addition to Listen and Compose mode, introduce another mode that could be called “Autoplay” (name up for debate).

The idea is for the player to become maestra and band. First you would configure which tunes and which breaks you want to play and which instruments the player should play. Then the player would start to maestrate. It would always pick something random to play next, and, like a maestra, would announce it first and then whistle it in. For a start it would be fine to make it announce the next breaks and show the tempo in text, later an animated drawing of a person showing the signs could even be shown.

There are two use cases:

• A band meets for a rehearsal but they are not enough people. The player can take the role of the maestra and the missing instruments, and the people can play along.
• A person wants to practice at home. The player takes the role of the rest of the band, and by showing random breaks and actually playing them, the rhythms can be practiced in a more realistic scenario than just listening to them or reading the notes.