We have inherited this desk for our theatre group in Wimbledon but no one knows how to use it. How do we set it up so that each of the sliders maps to the same DMX address ie slider 1 controls address 1, slider 2 controls address 2 ...........slider 24 controls address 24. We don't need separate banks, presets, chases or any of the other functionality. Currently, all the lights connected to sliders 13 - 24 control the lights as expected. None of the sliders on the lower back 1 - 12 seem to work in this simple mode. What are we doing wrong?