Go to: Applications > Utilities > Audio MIDI Setup > Window > Show MIDI Studio (⌘2)
Your MIDI device driver should show up as an icon as the example above shows. Sometimes even though this icon is shown in the MIDI Studio, it will not connect the first time. You can disconnect your MIDI device and then with your device icon highlighted, select 'Remove Device'. After doing this reconnect the MIDI device and the driver icon for this device should reappear. Now check to see if your device has been recognized.
If you have tried everything above but are still having problems then the next step is to check that your MIDI controller is communicating (sending/receiving) MIDI messages with your computer. This is the basic functionality of MIDI and if your controller is not communicating with your computer then it is not going to work.
We can check to see if MIDI messages are being communicated between the computer and the MIDI controller quite easily using an application that monitors MIDI messages being sent from a MIDI deviceMIDI monitor.
- If you are unsuccessful with connection and your controller is not sending MIDI messages, try testing your controller with a different computer by following the steps in this article.
This helps to narrow down the cause of the issue. If your controller is still not behaving correctly with a different computer, then it is possible that the controller may be faulty.
However, if it is working correctly, then further troubleshooting may be required with your computer.
Let us know if you require any assistance.