TapNoiseOn compatible MacBooks, TapNoise uses the laptop’s motion signal to vary typing sound volume. It is an estimate from body movement, not a force sensor measuring each individual switch.
What changes in the sound
Softer activity moves the playback level down, while stronger activity moves it up. The implementation smooths recent measurements rather than waiting for a new impact before starting every key’s sound.
That timing matters: a key’s vibration can arrive after its audio needs to begin. Recent presses inform the next playback level, so the effect should not be described as a laboratory measurement of that exact key’s force.
The setup affects the signal
The desk surface, laptop placement and external keyboard arrangement can change how movement reaches the sensor. Keep the Mac stable and use ordinary typing when testing.
Do not press harder or strike the computer to force a reaction. If the hardware is unsupported, the app’s availability message is the useful answer; a different permission or more force will not create the sensor.
Interpret reminders carefully
TapNoise can learn your usual activity and nudge you when it detects harder typing. That is a behavioural prompt, not a diagnosis of strain or proof that a particular force is safe.
For supported Macs, see the requirements. For fixed playback preferences, the volume slider remains the direct control, and motion versus lid sensing explains the other hardware path.
Sources: TapNoise hardware support, typing nudges, TapNoise’s KeyPressure implementation.