Hi, I am new to this and will probably do a lot of things wrong but I have good intertions. I am working with a 6 year old child that has Spinal Atrophy 1, he cannot hold up his body or head and has very limited motion. However, he can direct his chair with a trac ball, but again with very limited motion, but he can move the trac ball. Is there a way to connect a trac ball to an ipad so that he can play the piano using Piano Pro or anything else. Thanks for any and all help.