> is it written and also synthesized in Squeak?

Written only. It's synthesized by a set of VST instruments hosted in 
Cantabile.

> Not sure if I like it (wrong music for this moment) but it's impressive
> that this could be done by playing with morphs.
>
> I'd be very curious to watch a video about the composition process, or
> maybe read a writeup.

Yes, I need to document muO editors. So far all written doc is a bunch 
of PDF documents you can get from
http://www.zogotounga.net/comp/squeak/sqgeo.htm


Best,

Stef