Volume control
Tap the option 'Volume control' to show or hide the volume control in the kiosk:
 
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Tap the icon to show the volume control overlay: 
 
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Move the slider to apply a new volume. 
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Tap the icon to close the overlay. 
Tap the option 'Volume control' to show or hide the volume control in the kiosk:
 
Tap the icon to show the volume control overlay:
 
Move the slider to apply a new volume.
Tap the icon  to close the overlay.