Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 443)

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3 Custom Function Settings
Memo audio quality C.Fn7
When you record a voice memo, you can set the audio quality.
High quality (48 kHz)
You can record the voice memo at the same audio quality as a
movie.
Low quality (8 kHz)
The voice memo’s file size is smaller than with [ High quality (48
kHz) ].
Default Erase option C.Fn7
During image playback and image review immediately after shooting,
when you press the <
L > button, the erase menu appears (p.386). You
can set which option, [ Cancel ] or [ Erase ], is to be preselected on this
screen.
If [
Erase ] is set, you can just press < 0 > to quickly erase the image.
: [Cancel] selected
L : [Erase] selected
If you record another voice memo to an image that already has a voice
memo, the audio quality will be the same as the first voice memo regardless
of this setting.
If [ Erase ] is set, be careful not to erase an image accidentally.