- Install drivers for the CDJ/DJM.
- Launch rekordbox and go to PERFORMANCE mode.
- Connect your CDJs/DJM via USB cables. (Mac) Launch CDJ aggregator to create audio device settings for .
- Push [Link] button on the CDJs
- Turn the browse rotary encoder to assign which channel to control
- Go to [Preferences] -> [Audio] -> [Audio] and check if the device is DJM-900.
- Close the [Preferences] and now you can control from CDJ and sound from DJM.