Inilne Button Controls

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I've got an XPS 15 9570 on Catalina 10.15.4 with OpenCore 0.5.7.  I've gotten audio working well on my Realtek 3266 (298) with layout 22.  Speakers/mic work, as do line out and line in (with ComboJack).  However, the buttons on my headset don't work like they do on a "real" mac.  I've been able to found very little about fixing this; does anyone know how I might go about solving it?

 

Thank you.