Patter generates music a few notes at a time, in “segments”. A segment is just one or more notes (and rests) of equal duration. You control how many, and what duration.
Patter's numeric inputs are all randomizable, using a handy bell curve input to control the mean value, and the amount of deviation.
Patters can cue other Patters in the same set, to produce more complex musical interactions.
See also the manual.
Max users: get the free and open-source Patter Tools for a minimal generative sequencer and supporting externals.