You can delete a disabled device from AMS by simply selecting it and pressing backspace - enabled devices cannot be deleted and need to have their driver software uninstalled to become disabled devices first. Secondly, the device might have had its driver software uninstalled from your Mac, but the ghost of the device is still lingering on. There are two common reasons for devices appearing disabled in AMS: firstly, the device might be a USB MIDI device where the driver has been installed, but the device isn't actually connected, or it might be powered down. However, there's a slight caveat to this rule because a device can also appear disabled in AMS, which is when it has a fainter appearance than devices that are enabled, and it's important to note that disabled devices will not be accessible to applications using Core MIDI. If a MIDI device shows up in AMS, you know that it's been correctly installed. However, Core MIDI also offers built-in support for USB-based MIDI devices that conform to the USB MIDI-Class specification, so certain USB MIDI devices will actually work without needing any extra drivers. As discussed in last month's Apple Notes, drivers for Core MIDI tend to live in the Local domain's Library / Audio / MIDI Drivers folder (at the root level of your Mac's boot drive). Notice how the MT4 device appears fainter than the other devices, which indicates that it's currently disabled.When you attach a MIDI device to your Mac, it should show up in Core MIDI, assuming you've installed the appropriate driver software for the MIDI device in question. The MIDI Devices tab of Audio MIDI Setup shows MIDI devices available to Core MIDI applications. The built-in devices are a subject for another day, but simply put, the IAC Driver manages MIDI ports that enable MIDI messages to be sent between applications running on your Mac, while the Network device sets up MIDI ports enabling messages to be sent between applications running on different Macs. In the application's MIDI Device tab you'll see visual representations of the MIDI devices available on your Mac, which include those that are built into Core MIDI (OS X's MIDI framework that arbitrates communication between applications and MIDI hardware), such as IAC Driver and Network, and any additional hardware MIDI devices you've attached to your Mac. Managing MIDI devices in OS X is pretty simple thanks to the Audio MIDI Setup (AMS) utility that's supplied by Apple. This month we're going to delve into the MIDI Devices tab, in order to explain how applications work with the MIDI hardware you've connected to your Mac. Audio MIDI Setup is the Mac OS X utility that allows you to set up audio and MIDI devices.
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