code: func EndOfTrack() *Event {
  	return &Event{
  		MsgType: uint8(EventByteMap["Meta"]),
  		MsgChan: uint8(15),
  		Cmd:     MetaByteMap["End of Track"],
  	}
  }
docs: // EndOfTrack indicates the end of the midi track. Note that this event is
  // automatically added when encoding a normal track.