Carry out the following steps.

1. Connect the unit and the DJM-A9, DJM-V10 or DJM-900NXS2 via PRO DJ LINK.

2. Press the [LINK CUE] button on the DJ mixer.

3. Touch the waveform on the browse screen or the playback screen.

You can monitor a track even when outputting the sound of a track that is playing on the same player.