I'm a little confused about installing a FLOATING floor that Russ Hershelmann refers to in all of his articles. I'm in the serious planning stages of converting a garage into a home theater when I move into my new house in the next 60-90 days. Obviously I'll be dealing with concrete floor. For a similar example for a floating floor, Russ recommends 3/8" soundmat, 3/4" plywood or OSB, then the carpet pad, and then carpet...my question is does the PLYWOOD or OSB just lay on top of the soundmat? Does it get affixed to the floor in any way? I don't know about you guys, but relying on the pad & carpet to keep a handful of sections of plywood laying perfectly flat isn't too confidence building. Thanks for any insight you might be able to provide.