HTC Desire HD User Manual page 65

65 Keyboard
Other settings
Sound feedback
Vibrate when typing
Finger touch precision
Calibration tool
Reset calibration
Select to hear a clicking sound whenever you tap a key on the
keyboard.
Select to enable vibration feedback whenever you tap a key on
the keyboard.
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.
Tap to reset the calibration back to factory default.