Shorting the mic signal is not a straightforward solution. For one thing, you can just amplify your signal right back up to intelligibility, since 40-60dB atte

Shorting the mic signal is not a straightforward solution. For one thing, you can just amplify your signal right back up to intelligibility, since 40-60dB attenuation doesn't go under the noise floor of a well-designed system. Just send the mic signal through an op-amp with an enable input.