I've never heard of "progressive rhythms" before, though it does sound as if it
could be related at least. I am not all-knowledgeable about this, and I'll
check some of my books to see if they say anything.
In a search, I did find this site which some of you may be interested in. It
also has a downloadable demo file of about 2.77MB.
Fractal worlds: http://profantasy.com/products/ftclick.asp
Lawrence A. Parker
Philosopher and Educational Consultant