It sings now

Looks like Gamemaker can handle pitch changes OK, so the Dunc's AlgoMusic Mk VI prototype is happily producing some random notes with simple chord progressions. Some of the output is quite nice to listen to already. I will try and upload a video of the progress at some point.

Things to work on:

* It can't be all prefab chord progressions, it needs to go crazy sometimes.

* The melody should sometimes have motifs, and some tracks should carry through chord changes more fluidly (currently all the tracks shift pitch in the same way when the key changes)

*Structure vs. Randomness

*Need to add that "Name your song" button, which was the main appeal of previous versions.