We have confirmed a compatibility issue with MacOS 10.13 (High Sierra) running on Mac models released in 2014 and after. Connected USB-MIDI devices will not be recognized by MIDI application programs when the KORG USB-MIDI Driver is installed on these Mac models.

Disconnecting and reconnecting the USB-MIDI device may fix this issue, but if it is not, please follow the steps below to uninstall the KORG USB-MIDI Driver.

1. Download the KORG USB-MIDI Driver Uninstaller (Uninstall_KORG_USBMIDIDriver.zip).
（ Download from here ）
2. Unzip it, and start the Uninstall KorgUSBMIDIDriver.
3. The authentication dialog will pop up. Enter your password, and click OK.
4. Another authentication dialog will pop up. Enter your password, and click OK.

It is possible to use USB-MIDI devices without the KORG USB-MIDI Driver, but the following issue may arise.
- MIDI data transfer may take more time due to slower MIDI communication speed.
- There may be a problem when the Control Surface plug-in is used with nanoKONTROL2 or nanoKONTROL Studio*.

*We are investigating the issue now, and would like to ask for your patience until we find a solution.