There are six possible causes.

1. Are this unit and the computer properly connected? Connect this unit and the computer properly using a USB cable.

2. Are the audio output device settings properly set? Select this unit in the audio output device settings. For instructions on setting your application, see your application's operating instructions.

3. Is the driver software installed? For instructions on installing the driver software, see “Installing the software” in the operating instructions.

4. Is the [DIGITAL, CD/LINE, PHONO, LINE, USB DECK*] selector switch set to the proper position? Set the [DIGITAL, CD/LINE, PHONO, LINE, USB DECK*] selector switch to the [USB DECK*] position.

5. Check that the TRIM control, channel faders, crossfader, MASTER LEVEL control, EQ control and FILTER control are set to appropriate positions.

6. When multiple USB devices (a mouse, a keyboard, etc.) are connected to the same USB bus or USB hub on the computer, the unit 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.