I figured garageband users could help, so please forgive me for posting here. My Keystation 49e doesnt work anymore. I believe it has something to do with the 10.3.9 update. How do I go about fixing this? I deleted the Audio Midi Setup Devices, deleted the Midi Drives in the Library>Audio>Midi Folder, then replugged my keyboard and it still does not work. OSX will not recognize its existence. I did a search online and it seems someone had a similar problem, and his solution was to repair the CoreMidi Server Framework, as he claims he used terminal to see that it was damaged. I have no idea how to repair the CoreMidi Server Framework and, as of yet, use Terminal.