Based on flash, the experience is build around a set of abstract pictogramms always changing, growing and reducing with the music rythm. After several test synchronizing animation and music spectrum, the team decided to use IPad as an input device in order to allow the musician to create unique animation using his fingers, reproducing the feeling he can have while playing guitar. The video below will give you a better idea of the process. I suggest you to visit the website and the project page on the Britzpetermann's website.
Project page on Britzpetermann's website.