I have a fixture that switches from 2 locations. I am installing dual dimmers on this fixture. the dimmers are a master / slave dimmer setup. I have found the traveler wires (red and black) the other wires available from the old switches are black and ground (bare) wires. The whites are all tied together. Do i need to open the white wires and bring out a white lead to the new dimmers? the master dimmer has 7 wires (Leviton (bluetooth) DD710-BD). Will I need all seven leads?