There are five possible causes.

1. Is [FADER START] set to [OFF]? Set [FADER START] on the [USER SETUP] screen to [ON]. For details, see "List of Setting Items" in the operating instructions.

2. Is the firmware version of the CDJ-2000nexus 1.02 or higher, or the firmware version of the CDJ-2000 or CDJ-900 4.00 or higher? In order to use the fader start function, the CDJ must have the latest version of the firmware. The latest firmware version can be acquired from the Pioneer DJ support page.

3. Is the DJ player properly connected to the [LINK] terminal? Connect the DJ player to the [LINK] terminal properly using a LAN cable. For details see "Connecting the Input Terminals" in the operating instructions.

4. Are the audio cables properly connected? Connect this unit's audio input terminals to the DJ player's audio output terminals using audio cables. For details, see "Connecting the Input Terminals" in the operating instructions.

5. Are the DJ players' player numbers properly set? Set the DJ players' player numbers to the same numbers as the channels to which the audio cables are connected. For details, see the respective player's operating instructions.