I came across this a while ago and it seems like he has discontinued developing the software. If anyone out there wants to take a stab at re creating the idea behind the app I think it would be a great tool! I know j74 progressive is a real close concept. I just like how this app integrates simple music theory like natural cadence etc. Here are some videos to get an idea.
https://vimeo.com/31843568
A few other videos on the subject.
https://vimeo.com/32134012
YOUtube
https://www.youtube.com/watch?v=6MtHUpr8sZM
https://www.youtube.com/watch?v=DthJoIWEBqk
https://www.youtube.com/watch?v=qrACwhSc5WM
https://www.youtube.com/watch?v=YezkughbEEo