Turn your camera on with a long press of the power button. If the video icon is visible in the top left hand side of the screen, press the power button twice more to enter the Main Menu.
(if the camera icon is visible instead, you will only need to press the button once more – this is because the power buttons functions cycle from Video to Photo to Main menu back to video etc)
When in the Main menu, use your side scrolling keys to cycle to the Setup Menu. When this option is highlighted, select the shutter button (the ‘other’ button) to enter that menu.
When in the Setup Menu, use the side scrolling keys to scroll down to Audio Sensitivity. Once this option is highlighted, use the shutter button (the ‘other’ button) to enter the menu.
Again, use the keys on the side of the camera to scroll down to Audio Sensitivity. Once highlighted, press the shutter button to enter that menu and then use the side scrolling keys to move through the options. When you’ve selected the volume you want, press the shutter button. This will accept this option and take you out of the Audio Sensitivity options. To quit the menu completely, press the power button lightly. This will take you out of the Setup Menu and back into the Main menu. Press the power button briefly again, and you will be back where you started, as though you’d just turned the camera on.