Olympus IR-500 Basic Manual page 34

Playing back still images
How to play back the recorded sound
When a picture with sound is displayed, the sound is reproduced by pressing 9.
Tip
You can play back the picture you have just taken by pressing h. For details, see "Easy playback with the
h button" (g page 48) of the Reference Manual (CD-ROM).
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Turns up the volume.
OK
Turns down the volume.