A midi output application acts as an information consumer by subscribing to midi short commands which are received and forwarded to a selected midi device which may be internal software or external hardware Midi输出应用程序通过订阅midi短命令充当了信息消费者，收到这些命令后将他们传送给所选的midi设备，这些设备可以是内部软件或外部硬件。
