Canon EOS 1D - Manual (Page 174)

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You can append a voice memo to a captured image. The voice memo will
be saved as a WAV sound file having the same file number as the image.
The sound can be played back with the camera or provided software.
1
Select the image to which you
want to append a voice memo.
Press the <x> button to playback images,
then turn the <5> dial to select the image.
2
Record a voice memo.
While the image is displayed, press
the <H> button for approx. 2 sec.
When [Recording memo...] appears,
keep pressing the button and speak
into the microphone. The maximum
recording time for a voice memo is 30
sec.
To end the voice memo, let go of the
button.
X The < > icon will be displayed on
the top of the screen.
K Recording and Playing Voice Memos
Recording a Voice Memo
Voice memo microphone
You cannot append a voice memo to a protected image.
You cannot append a voice memo to a movie.
To record a voice memo longer than 30 sec., repeat step 2.
You can also record a voice memo once, right after image capture during
the image review by following step 2.
A voice memo cannot be recorded with an external microphone.
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