I prefer to just write a bunch of riffs and see where they grow organically, but it seems the chain would be a great tool to piece some of those ideas together or give an indicator of where they could go when a creative block is hit.
I mean, most music is terribly dull and meaningless in the grand picture of things. The selection of input would be more like the job of a DJ. I don't know how much creativity can be fit into programming the chain, what features to pickup. It would probably just be a part of a bigger workflow, starting small, creating short samples, arranging those, and cetera.
For the story it helps that Aphex Twin is rather random to begin with (e.g. having created a song by reverse fourier syntheses over a gray scale picture, creating the sound to a desired spectrogramm). The irony is appreciable, though comendable if someone likes the result.
Didn't want to explicitly promote it here in the thread, but I'm building it to serve as a general music-content engine for artists (also for my own music, let's be honest) that will let you upload composition parts and the player will put them together on the fly. It already has interactivity built in where you can serve a different version of a track based on changing inputs you connect from your Internet presence etc. Plus, you can DJ with it, it supports smoothly changing playback speeds. It needs to happen.
Some video games do this automatically with their in-game music, but not all, and many streamers prefer using other music to avoid it getting stale.