I bought an Intermountain EMD F7A and F7B with decoders installed. I watched it run and all functions worked properly.On my layout with the EZ Command only the direction controls and diesel engine sounds work.I have tried all other nine buttons (loco is set to 3) and can't make the lights,horn or bell work.What do I need to do? I have seen videos of these functions being operated from the EZ Command so it is possible right?