说明：  key player:键盘符号播放程序。只要把需要输出的键盘字母粘贴到文本框上，就可以循环播放你想要键盘符号。主要针对于键盘式电子琴，把歌谱粘贴在上面，就可以控制电子琴自动弹奏！
(key player: the keyboard player symbols. As long as the output of the keyboard letters need to paste it into a text box, you can cycle the keyboard you want to sign players. Mainly in the keyboard-style organ, the sheet to paste in the above, you can control automatic electric piano playing!)