I found this and think it is quite cool. Maybe you can do some cool math with it. Or just have fun making music. Here is an example of use that is both visually and audibly pleasing. http://www.earslap.com/projectslab/otomata?q=4h4t5j7k444c1z3l2i7o631078051q8... It's intuitive. But directions are there. Have fun! -Robert