Pentax Optio WP Operating Manual page 147

• If you press and hold down the shutter release button in Step 4,
recording continues until you take your finger off the button. This
is useful for making short sound recordings, such as for the user
sound in the [Sound] menu.
• Sound is saved in WAVE monaural files.
• Pressing the 4 button clears the voice recording screen from
the LCD monitor. Press the 4 button again to display the voice
recording screen.
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