get MIDI_SYSTEM_MESSAGES() {

    if (this.validation) {
      console.warn(
        "The MIDI_SYSTEM_MESSAGES enum has been moved to " +
        "Enumerations.SYSTEM_MESSAGES."
      );
    }

    return Enumerations.SYSTEM_MESSAGES;

  }
@private
@deprecated since 3.0.0. Use Enumerations.SYSTEM_MESSAGES instead.