The message [Error: Failed to connect audio!!] is shown, or the virtual deck disappears immediately on the Serato DJ Pro screen.

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 in the following sequence:

■ Windows
1. Close Serato DJ Pro and disconnect the DJM-S5 from your computer.
2. Open the control panel (or [Start] > [Settings] > [Apps]) and uninstall [DJM-S5 Driver].
3. Quit Windows.
4. Disconnect other USB devices, USB hubs, etc.
5. Start Windows.
6. Download 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 DJM-S5 to another port without using a USB hub, etc.

If you still experience the problem, it might be caused by operating system sound settings, etc.
Remove all other USB devices from your computer.
Follow the instructions in the troubleshooting guide Case 3.1 [Check the default device selected in the [Sound] panel] or Case 6 [here].
*The guide is for rekordbox users but you can fix the problem in the same way.

■ Mac
Follow the instructions in the troubleshooting guide [here].

If you still experience the problem, it might be caused by operating system sound settings, etc.
Remove all other USB devices from your Mac, uninstall the virtual audio device etc, and restart the Mac.