My W10 sound system has never had the functionality of Stereo Mix, and after following many Youtube examples of how to bring it up (seems often hidden, why I don't know) I have decided it is just not there in the drivers. Nothing I do corresponds with the flow seen in the tutorials. I found the Vendor ID 111D and Device ID 76E0 but Device Hunt could match nothing. [HP EliteBook Folio 9470m]. If we can't figure this out, perhaps I should experiment by installing some alternative drivers semi-randomly and seeing if they work? (after setting a system restore point). For certain software of my own devising, I really need this functionality; fortunately I still have my old XP system running with a big monitor, that I use as a 'desktop' system, but would like my traveling machine to have it too.