Pentax Optio W10 Operating Manual page 156

• If you press and hold down the shutter release button for more
than one second 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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