How to sound key?
At first, could you confirm that the in-app setting is “on".
ge-calc memo screen → Gear icon → In-App setting screen → Key Sound “On"
Volume of device
Is the volume of your device loud enough?
I recommend that you keep up a certain volume because it is a subtle click sound.
Sometimes it will be fixed by rebooting your device/iOS for reset.
Long-press sleep button of device → Turn off your device → After the device has been off, long-press sleep button again to turn on the device.
Still it remains
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