one of the first to allow for non linear song arrangements, with sequences being able to play other sequences, which you can nest as many times as you like, which I used to great effect in my Jungle/drum and bass productions
You just draw in a play sequence command, much like penciling in a note in the note editor, and not unlike song arranging in modern DAWs, but this happens inside the midi note editor
Sadly something that is quite hard to find these days!
http://www.muzines.co.uk/articles/music-x/5672










