Classic Piano：Real Virtual Piano Keyboard

6/9/2018

1. Supply Dual Row Mode and two Player Mode
2. Supply three kinds of "Study Mode" for beginner: Light Hint, Note Wait and Listening
3. Add more options to control piano: "Keyboard locker", "Vibration" and "Sustain Control"
4. Add "Novice guide" and "Instructions" to help user to learn the app
5. Optimize the performance of sound engine
6. Enhance the UX of adjusting the key count, keyboard preview slider and metronome
7. Optimize the UI of some scenes
8. Fix some bugs and issues