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5 Parts and Controls Front Panel Buttons The up and down arrow keys are used to move the cursor through a list of parameters in a window. Note that parameter entry will not be accepted if the up or down button was pressed before Enter. Thus these keys can also be used to intentionally cancel a change to a parameter. If the list is longer than can be displayed in a window, U and D can be used to scroll the list. The left and right arrow keys have two functions. When entering or editing a numeric parameter these can be used to move from digit to digit. When setting some parameters these are used to change the option. Remember, you must always press Enter to save a new value or option. These are the display contrast adjustment buttons. They can be used at any time to increase or decrease the contrast of the display. 27