UPDATE: Now it plays sounds (by chance I found it works with headphones, i.e. not loudspeaker), recording works as well, b u t, the question mark =help menu is still not working correctly, because there is no normal method to go back to the menu. Now three stars kind of fair. The app does not work that means it doesnt play a single tune. And, there are screens which you only can leave when you close the app to come back to the instrument screen. Compared with other music apps its pretty expensive but for no audio function at all. It shows only some nice screens. That is totally ridiculous and unacceptable. Who approved this? I want my money back!