Here's Bernhard with something about it. https://www.pianostreet.com/smf/index.php?topic=16079.msg222411#msg222411I'm not sure if that's *the* post about it though.I hope Bernhard's not basing everything off this article he mentions.Miller, G. A. – “The Magic Number 7 ± 2” American Psychologist, 1956From 1956? We haven't learned more since then? Unless that's the study on how many digits a human can remember, 7, give or take two digits.