I have the Operator Pro set up with 6 fixtures. All fixtures are addressed correctly. On the Left side of the board the fixture buttons (1-6) will trigger the light, but only fader #4 affect them in any way. In the menu, 0-50 on the slider-nothing happens. above 50 it will cycle through various color and strobe settings. No other sliders do anything, even basic color, sliders 1-3, nothing happens. Is this a defective board? or is there a setting that I am missing?