Piano

代码说明：

  用Matlab GUI编写的一个虚拟电子琴（模拟信号发生器）的简单小程序，可以自己编乐谱，也可以在键盘上谈乐谱。(Matlab GUI written with a virtual keyboard (analog signal generator) is a simple little program, you can own series music, you can talk about music on the keyboard.)