Very interesting thread - this is one way to look at chance operations, algorithms and so on - I wonder if there is another angle to the ‘role playing game’ idea that could be developed here as well; the idea of a collaborative narrative imagination that produces musical ideas. I think this sort of thing was used by Eno and Bowie at some point (‘imagine you are an alien using a sonic weapon to liquify a rival’ sort of thing). This could produce a whole world of sound ‘props’, landscapes, languages and so on.
Another kind of role playing might be at play in Can’s Ethnological Forgeries Series.
And in terms of describing imaginative musical ‘role play’ I think this is a great podcast episode:
… and I must drop in a word for the great ‘Dune’ album by Z (Bernard Szajner)