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It's a selling point. You plug anything at the back then change the jack's purpose in the control panel gui for the audio card.

Possibly, but why isn't the feature exposed to end users then?

It is. I've seen it on multiple computers.

Yep. I remember that feature from the Windows NT days.

As a sound engineer, I can assure you that this feature has been around for ages.

Well then what the article describes is not even a "hack"...

welcome to wired.com

Wait, I thought that was the median hackaday comment?