PS: We also care about the tone of the notes, not only about the timing
of the notes. Tone of a note is not only related to the kind of touch,
but also of the timing, regarding phases to the other instruments that
are played. I suspect that human jitter is less randomly as machine's
jitter. Neuroscience can't explain a lot of human abilities.
https://www.google.de/search?q=savant+painter&biw=1152&bih=709&…
;)
http://www.stephenwiltshire.co.uk/Tokyo_Panorama_by_Stephen_Wiltshire.aspx
This and a few other "particularities" aren't seldom for all kinds of
artists.