> Keep in mind that this set of notes is not the actual program; if a MIDI file is created from this progression of notes, the concurrent notes might be interpreted in a different order in the file, and create an invalid program.

Is the order of notes within a chord the _only_ extra info required on top of a musical score? If so, with some "tie-breaker" I think you could encode any Velato program unambiguously in sheet music.

For example, if notes in a chord were interpreted as commands from lowest to highest pitch, you could move notes up and down by octaves to determine the command order. Just a thought... I like the idea of piece-as-program.