lost engine sound in open wheelers

For some reason I cant work out. I have lost all my cars engine sounds (AI cars are fine) apart from when in chase view, This only happens in single seaters /open wheeled cars? saloons, trucks etc are fine... any help please.

did read an old post on another site that realtek sound should be run in stereo mode? Mine is set to 5.1 so I can run simhub to work my shakers.... however did try setting to stereo, but made no difference??/
 
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