How to enable headphone button control

I've got an XPS 15 9570, OpenCore 0.5.7, Catalina 10.15.4. I'm using AppleALC layout 30 with my ALC3266/298, and audio is generally great: speakers work fine, volume control works fine, headphone jack works fine, switching is seamless, no weird audio issues or quality problems.

There's one problem, though, and I haven't seen it mentioned elsewhere. I've got inline buttons on my earbuds: volume up, volume down, pause. These work fine on a "real" macbook and on windows, but don't do a thing on my hackintosh. Maybe my google-fu is rusty, but I've found nothing on how to resolve this. Does anyone have advice on how this might be accomplished? Or is it simply unsupported?

Thank you.

submitted by /u/normanhhackler
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