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The DDJ-200 does not have a sound card built in, there is no audio driver for it. The audio comes out of the computer via the supplied cable. If you got it second hand, make sure they gave you the audio splitting cable you need to use the unit
Thank you very much for answering BriChi, I do have the audio splitting cable yes. I'm having trouble splitting the audio though and have tried different settings so thought it must be the not having a driver. Ah back to the drawing board I guess. Thanks though.
few things i can suggest is
1. make sure you have the late version of rekrodbox
2. make sure the "split audio" icon is clicked and on
some instructions here that are good
https://wearecrossfader.co.uk/blog/getting-started-with-the-ddj-200/