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Why would you do this with an AND gate and not just just use the switch itself to cut/connect the mic? Much easier to show/verify it is hardware switched for anyone with basic understanding!
Because it's a multi-MHz digital signal and sending it to the switch could cause issues, because then you need *two* wires going off to the switch daughterboard, because the software also needs to know the switch state so now that's a DPDT switch. Plenty of reasons.
FWIW, their solution is exactly what I would've done. It makes the most sense from a design perspective.
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