YouTuber Michael Lohmeyer did a beautiful little piece with evolving notes in Fugue Machine.
This is an automatically played piece of music in AUM in an iPad (an app that is kind of a mixer for playing a bunch of music instruments), using several synthesizers and drum machines. The notes are sequenced, meaning I set a pattern that repeats, or used Fugue Machine to generate notes in an evolving pattern. The result is a varying passage of music created with only simple note partterns.
I open all the different synthesizers and plugins to show them, and also show Fugue Machine, which is the thing with a piano role like series of notes. The cursors in Fugue Machine play forward, backward, and at different speeds which creates a highly variable series of notes based on a single smaller set of notes. Fugue Machine is actually a concept used by Bach in his music and is pretty amazing what it can create.
Finally, the Synthmaster One synthesizer is using ARPs with Fugue machine to create the cascading melody of notes that makes up most of the composition. So it creates a highly variable series of notes, but always based on a key and chords chosen by Fugue Machine.