I am thinking about DCC control for a new layout I am building and am new to the whole DCC system. Here are my questions; 1. Do all DCC systems control turnouts, sound & lights from the engines? 2. Does the sound come from the engines? 3. Does the decoder in the engine do all of these things for me? 4. What extras do I have to buy in order to 1. Run about 6 trains 2. Control turnouts 3. Integrate track signals and crossings 4. and finally have some cool sounds coming from my engines Attached is a rough drawing of my intended layout each square is 1 foot. Thanks for any clearification you can provide before I make this investment. Regards, Gosh... what a crappy picture this is but you get the idea.