This is a patch that could run for hours. The preview is just four minutes. The patch is aleatoric in that the sounds come and go at random. It is ambient in that is can play in the background for as long as you like.
The sketch is based on the pitch-class set 5-27. Here is a poser for the music theorists in the audience: Which composer of generative electronic music used this PC set exclusively in one piece and what is that piece? Please leave a comment if you know.