REKORDBOX DJ 4.0.1 RECORDING ISSUE.

Same problem here, sometimes it works but most of the time it doesn't. I tried several things; restart RB, restart laptop, first start RB and then SX and via versa, power off and on, etc. etc.

Try changing the audio device in the AUDIO tab preferences to your controller.

@insmyk, Thanks for your reply. I tried that with no result. What I do now is start my laptop and DDJ-SX and XDJ-1000 at the same time. Now I can record my mix.