The in-box driver uses the supplied jack information when handling the KSPROPERTYJACKDESCRIPTION for this device. I am not sure why my XP machine could not do this yesterday, nor why the W7 machine couldn’t do it yesterday nor today. Starting in Windows 10 release 1703, IHVs that create USB Audio Class 2.0 devices having one or more jacks have the capability to describe these jacks to the in-box Audio Class 2.0 driver. I suspect the main problem was the inability of my W7 machine to directly download the drivers. Not sure how ordinary users would get this done (I’ve been doing this for >50 years.) (I know, not always a good idea to cross-dress drivers but the code looked benign.) That all worked finally. Then I had to do a manual install (Device manager, …, update driver, browse for drivers) on my W7 machine. Both machines are behind the same firewall and running Norton Security.) I installed on my XP, found the drivers (2 ser*.sys files) and copied them over to my W7 machine. I was still unable to download the drivers from amazonaws on my W7 machine, but unlike yesterday I could download them on an XP machine. >Thanks for posting your question here, do you have a Plugable USB to Serial adapter? I’m impressed! Thanks for the fast response.
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