HTC Aria AT&T User Manual page 67

Other settings
Sound feedback
Select to hear a clicking sound whenever you tap a key on the keyboard.
Vibrate when typing
Select to enable vibration feedback whenever you tap a key on the keyboard.
Finger touch precision
Calibration tool
Tap to re-calibrate the keyboard touch accuracy. Re-calibrate the keyboard if you feel that
the keyboard keys are not responding accurately to your taps.
Reset calibration
Tap to reset the calibration back to factory default.
Keyboard 67