Pentax OPTIO A40 - Manual (Page 46)

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Shutter release button
When pressed, starts recording. When pressed again, stops
recording.
When pressed for more than one second, recording continues for as
long as the button is held down and stops when the button is released.
Q Playback button
Switches to Playback mode. (1p.40) When pressed again, returns to
Voice Recording mode.
OK/Display button
Turns the LCD monitor on and off.
MENU button
When pressed during recording, an index can be added.
When pressed during standby or before playback, displays the
[A Rec.Mode] menu. (
1 p.45)
Voice Recording Mode
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