Canon MARK IV User Manual (en)

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Custom Function Settings
C.Fn IV -9     H button function
0: Protect (hold: Record memo)
When you hold down the <H> button for 2 sec., you can start 
recording a voice memo. When you let go of the button, the voice memo 
recording will stop.
1: Record memo (Protect: Disabled)
When you press the <H> button, you can start recording a voice 
memo immediately. When you let go of the button, the voice memo 
recording will stop. To protect an image, use the [3 Protect images
menu option.
2: Play memo (hold: Record memo)
Plays the voice memo appended to the image. Press the <H> button 
to play the voice memo. When you hold down the <H> button for 2 
sec. during image playback, you can start recording a voice memo. 
When you let go of the button, the voice memo recording will stop. To 
protect an image, use the [3 Protect images] menu option.
C.Fn IV -10     Button function when 5 <OFF>
0: Normal (enable)
1: Disable 
6,5,Multi-controller
When the power switch is set to <1>, the <6>, <5>, and <9> 
will be disabled from setting anything. The shutter button can still be 
used to shoot.
This prevents any settings to be changed inadvertently, so it is 
convenient when you keep shooting with the same settings.
Even with setting 1, if the power switch is set to <J>, you can use <6>, 
<5>, and <9> to change settings.
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