A musician may play a MIDI controller such as a keyboard, but the MIDI commands generated from the keyboard can be used to control one or more other instruments.
音乐家可以使用MIDI控制器进行演奏，例如键盘，但是键盘产生的MIDI命令可以用来控制一个或更多其它的设备。
Finally, a MIDI input application ACTS as an information provider by capturing MIDI commands entered via a controller such as a keyboard and publishing them to the broker.
最后，MIDI输入应用程序通过捕捉MIDI命令并将他们发布给代理充当了信息提供者，这些MIDI命令是通过键盘这样的控制器输入的。
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