When moving from one Pad mode to another (first press of the Pad mode button - solid led), the Pads [16] will trigger the function assigned to Pads 1 to 4 of the selected Pads page.
When one of the 4 modes is selected, press the same Pad mode button again (2nd press - led blinks). Then the 4 Pads [16] will trigger the function assigned to Pads 5 to 8 of the same selected Pads page.
PADS The functionality of each Pad depends on the selected Pad mode. Their functionality is explained in VirtualDJ User's Manual.