Actually yes you get the point it was a test but, in my study the main thing is the action and the feedback, i am an interaction designer more then a technologist.

You didn't put pictures of the circle scenario actually that make me think it was too difficult to understand how it works…

The circle scenario:
Tap n drag! a tap draw a circle the drag expand the circle, any circle generate a sound wave related it's position and diameter. You can have a sequence of 8 circles… maybe more i don't remember

Any circle deform its shape as the sound wave.

Now i should implement in a rush an amplitude modulator.

Thanks for all the feedbacks.