machambers

Hi, I picked up a used POD 2.0 and am trying to test that it works properly. It passes all of the built-in hardware tests and all audio outputs work. When I turn the Amp Models knob, should the display change to the Bank and Sound where the preset is stored? When pressing the Up and Down buttons the display does change. Aren't the knob and buttons doing the same thing, just by a different method? Thanks in advance.