Great to see this app in Extras! I did test it and something came in my mind. It would be nice to have ability to move/slide the onscreen-piano-keyboard left and right with arrow keys to choose the best area where to play at current moment. So then we could play on higher and lower register also.

Hope to see more sounds or some synthmoduling. One great feature would be some loop recorder. It would be awesome to play first bass line and let it loop and then add some more loops. All playing together.