MIDIComponent.onValueChange(handler)

Handle MIDI signal events.

The handler gets two parameters, first the value of the signal and second an object with more information about the origin.
译：信号处理MIDI事件。

该处理程序获取两个参数，首先信号和第二个对象的值和来源的详细信息。

midi = new MIDIComponent

# Print the identifier of the control sending the change 
midi.onValueChange (value, info) ->
  print info.control

See the Get Started section for more examples.
译：有关更多示例，请参见开始部分。

Properties

The info parameter is an object with the following
译：信息参数是一个对象具有以下属性：

1. control — the identifier of the control (knob, slider, etc.) sending the signal.
   译：控件 —— 标识符的控制旋钮，滑块等发送信号。

2. channel — the channel the signal is send over.
   译：通道 —— 通道信号的发送。

3. source — the identifier of the device sending the signal.
   译：来源 —— 发送信号设备的标识符。

4. type (optional) — "note" if the signal is coming from a ``note, the value represents the velocity,0``` means the note is off.

译：类型 —— "注意"如果信号来自一个注释，该值表示的速度，0意味着要注意了。