TapNoiseChoose the microphone in System Settings › Sound › Input, then check the meeting or recording app’s own input selector. Many apps can override the Mac’s default.
Verify with the meter
Speak a harmless test sentence and look for input-level movement. Adjust the input level if the device supports it. Close Sound settings when finished, since monitoring input can itself keep the microphone active.
If the meter moves but another person hears nothing, inspect the call app’s mute state and input selection. If it never moves, check the device connection and the app’s microphone permission.
Keep mute states separate
A meeting’s mute button stops what that app sends. A hardware mute switch or input-volume change can affect the microphone device more broadly. One state does not necessarily update the icon for the other.
TapNoise’s microphone knock action controls the default input device where supported. Test the exact microphone you plan to use; a device with limited controls may behave differently from the built-in mic.
Recheck after connecting hardware
A display, USB microphone or Bluetooth headset may add another input choice. Make a quick pre-call recording or use the meeting app’s test feature after changing the setup.
If Bluetooth playback quality drops when its mic activates, see headset call mode. If TapNoise goes quiet whenever the mic is used, that may be intentional.
Source: Apple’s input-device settings, TapNoise knock controls.