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You mean Pd, Max, or any other graphical interface?
Well, I'm not much aware or knowledgable about this subject but I do know that Brian Eno ( a well-known musician ) created a software program years ago which makes any piece of music perpetually change every time you listened to them.
Those changes were subtle mostly and could never be repeated in exactly the same way making each time you listened to them a unique experience ( much like a live concert ).
I haven't really followed its progress since ( or if he indeed did further developed it ) and not aware if it's freely available or just an idea that never caught on.
You might try to search the web for Brian Eno and perpetual music if interested.