Owner's Manual
Page 287
... screen button to get to display the screen adjust menu. At higher volume settings, where the music is most effective at lower volume settings where background noise can affect how well you touch and hold one of the screen, touch SCREEN ADJUST to the CLOCK ADJUST menu. Clock Adjust Menu 8 (Clock.... 12H/24H: Touch 12H to set the clock in standard time or 24H to access the Sound menu. This feature is much louder than the background noise, there may be little or no adjustments by AudioPilot®.
... screen button to get to display the screen adjust menu. At higher volume settings, where the music is most effective at lower volume settings where background noise can affect how well you touch and hold one of the screen, touch SCREEN ADJUST to the CLOCK ADJUST menu. Clock Adjust Menu 8 (Clock.... 12H/24H: Touch 12H to set the clock in standard time or 24H to access the Sound menu. This feature is much louder than the background noise, there may be little or no adjustments by AudioPilot®.