I can't set [AUDIO] in the rekordbox Preferences correctly

The installation of the driver software might be incomplete or the connection might be causing a problem.
If you’ve already installed the driver software, try again using the following procedure:

■Windows
1. Close rekordbox and disconnect the XDJ-XZ from your computer.
2. Open the control panel (or [Start] > [Settings] > [Apps]) and uninstall [XDJ-XZ Driver].
3. Close Windows.
4. Disconnect other USB devices, USB hubs, etc.
5. Start Windows.
6. Download the driver software from [here].
7. Install the driver software again.
　*An error will occur when the license agreement screen is displayed and you try to proceed without clicking "I agree".
8. Connect the XDJ-XZ to another port without using a USB hub, etc.

If you still can't set [AUDIO], the problem might be caused by operating system settings, etc.
See case 3 and 6 in the guide [here].

■Mac
1. Close rekordbox and disconnect the XDJ-XZ from your computer.
2. Download the driver software from [here].
3. Double-click [XDJ-XZ Uninstaller] to uninstall it.
4. Close your Mac and disconnect other USB devices, USB hubs, etc.
5. Start your Mac.
6. Double-click [XDJ-XZ AudioDriver.pkg] to reinstall it.
7. Connect the unit to another port without using a USB hub, etc.
8. Follow the instructions in the troubleshooting guide [here].
* Unnecessary for macOS Sierra 10.12