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I traced the path from the hardware switch, through a filter/debounce network, to the AND gate, and from the mics to the AND gate. So unless there are backdoor buried traces that bypass this (which would be hard evidence of a backdoor, since they would make *no sense*), it's safe
(correction, I meant PDM mics, not TDM; TDM is a different style, though PDM mics do time-division-multiplex the stereo channels, which is how I mixed it up)
