Ariworks contacted me to help create an interface for an augmented sound app. One caveat with the project was the limitation of iPhone technology. You can only use the app with headphones and a mic or else you get a latency loop ad infinitum.
The thought of theremins and other weird technological instruments came straight to mind after seeing the technology in use. From that idea hatched the user interface for the app. All wood and metal hardware like a Jules Verne wet dream.