Official comment
Andrew,
Try launching the Audio MIDI Settings app (found in Applications > Utilities) and open the MIDI Studio window. At the top of the window, click the drop-down and click New Configuration... and give it a name. See if the DDJ-SR appears on the list there.
Next, flip over to the Audio Devices window and make sure the DDJ-SR is not set as the default audio device for the Sound Outputs and Alerts.


