Update sketch.js
I added a label to the slider that shows when auto mode is on. I called it TurboMode.
(I am also working on trying to add dynamic graph to show the pdf. I am sure it would be trivial for you but I am still working out the details.)

This is great! I love the name TurboMode! I wonder it would make more sense to have the button say 'TurboMode' and then the slider label would actually say "speed: ##" and a number corresponding to the delay. I can merge this and then make those tweaks or let me know if you want to work on it more!
Love the idea of a graph showing the probabilities!
I like your idea of changing the button name, and then changing the slider label!