I have always thought a smartphone/ipad/tablet would make a brilliant instrument. Then this device came along which appeared on australia’s shark den. it’s the called auug and can be found at http://www.auug.com/order/ . You can download a free app but I think the holder is really good for children who need to understand spatial relationships and movement linked to events. As a performance tool it looks wonderful controlling video. What fun could you have with that feature!