Play a list of notes

The coll object stores an indexed collection of messages. You can trigger those messages to be sent out, just by sending coll the index of the desired message. One way that this can be useful is that you can make an entire musical score in the format of a collection of note messages, each of which contains whatever information you consider vital for describing a note. That’s similar to the way that languages like csound and cmusic read a score file to play notes.