Hi, I have a D300 and would like to experiment with multiple exposure and HDR while I'm visiting the scenery in upstate New York. I've read the manual on Multiple Exposure, and tested it a bit. I was expecting to hear the shutter multiple times based on the number of pictures I've programmed into the option. Is this not the case? Is the Multiple Exposure option basically just built-in HDR? Any tips for someone going to visit some waterfalls to take pics of the family using multiple exposure/HDR?