Here's one of those questions that gives away the fact that I'm a newbie. The question relates to the modular layout I'm building. Is the only advantage of the Homasote-type (or cork, for that matter) sub roadbed to dampen noise? If so, is there really much need for this stuff on a layout that will be run in a noisy train-show environment? Essentially, would it be okay to attach the code 100 Peco On30 flextrack right to the plywood trackbase? I'd hate to have to tear everything up later on because I did not ask and listen to sage advice. I posted this question elsewhere, so I appologize for the duplicate threads on different fora.