If a MIDI device isn’t working
Try these suggestions:
Make sure the MIDI device is properly connected to your Mac, or to a MIDI interface that’s connected to your Mac.
Make sure the device is turned on.
Make sure you installed any software provided by the manufacturer. Check the manufacturer’s website to see if you have the latest version of the software.
Make sure you set up the MIDI device correctly in Audio MIDI Setup.
Make sure the app you’re using is compatible with Audio MIDI Setup. For more information, refer to the app’s documentation.