Operation is possible with Serato DJ but the sound is not output (The DJM-S9 is not recognized as the audio device).

(1) Set the INPUT SELECT switch to the USB position.

(2) Check that the TRIM control, channel faders, crossfader, MASTER LEVEL control, ISO control, and FILTER control are in appropriate positions.
For details, see "No sound is output from the headphones or from Master Out" in FAQ.

(3) When multiple USB devices (a mouse, a keyboard, etc.) are connected to the same USB bus on the computer or a USB hub, DJM-S9 may not operate properly due to problems of USB bus bandwidth or conflicts between USB devices.
The problem can sometimes be solved by changing the USB ports to which devices are connected.

(4) Is the dedicated driver software installed?
The dedicated driver software must be installed before using this unit connected to the computer.
You can download the driver software from the following page.
DJM-S9　Driver Software

(5) Are DJM-S9 and the computer connected properly with a USB cable?
DJM-S9 and the computer must be connected properly.

(6) Is your Serato DJ software version 1.8.0 or later?
When DJM-S9 and the Serato DJ software are connected, you must use version 1.8.0 or later software.

(7) Is Track Gain Adjust or Master Output Level Adjust of the Serato DJ software turned fully down?
Adjust them to an appropriate position.
For details on making settings in Serato DJ, see the Serato DJ Software Manual.
Obtain the Serato DJ Software Manual from the following Serato website.
http://serato.com/dj/downloads#more-downloads

(8) Are the terminals and plugs dirty? Clean the terminals and plugs before making connections.