Override F9 on Keyboard to get All Windows?

Hi there,

So my new work computer has the next track icon on the F9 button on the keyboard. My previous work computer used to let me see all windows when I would hit F9 and I would like to be able to do that again. In System Pref > Keyboard & Mouse > Keyboard Shortcuts F9 is set up to show all windows but when I press it on the keyboard it still defaults to the next track command. Is there a way to override this and get my F9 = All Windows command back? Thanks!