You can’t cross-fade between cameras inside Aximmetry. This is because it only renders one perspective at a time. In order to cross-fade it would need to render the scene twice, effectively cutting the performance in half during the fade. You could program a custom “dip to black” fade in/out by triggering a smooth brightness animation from 1 to 0 and back to 1, while delaying the cut until the brightness reaches zero, effectively hiding the cut between cameras. If you want true cross-fade, you would have to use a professional studio setup, with one Aximmetry workstation per camera and an external video switcher.