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“Most computer microphones use the third segment to carry bias power for the microphone.” https://en.wikipedia.org/wiki/Microphone_connector
I had thought it was to deliver sound to both sides (rather than left- or right-only) but here we are.
LOL that’s not a stereo wire, that’s a headset combo jack.
I see two three pin 3.5mm stereo plugs (one of them color coded for the headphones and one for the mic), and zero 4-pin combo plugs?