I searched here, other forums, youtube and google and came up empty. Does anyone know how this setting works? We have been only using the microwave in the traditional way so far by taking the racks out and just having the glass plate in it. I know if using only the convection setting, you can use what you use in a conventional oven and you want a rack in it so air will circulate but we don't understand the Combi setting. Do we only use glass or ceramic bakeware or can we use metal? Do you have to remove the wire racks before using this setting or are the racks made of something that isn't going to cause sparks? If you have to remove the racks, how do you make a casserole in a rectangular dish while it's turning or do you have to use a square dish so it will turn? Why doesn't it spark all the time with the metal walls?