Cork, closed cell foam or plonk it straight on the baseboard, I am at that time when I need to make a decision as to what if any underlay should be used. Being that my layout is a sleepy backwater, there will be no need for tons of steeply graded ballast shoulders, nor neatly laid ballast that looks like it's better suited up someone's driveway. There's the old school that prefer the cork roll and then the fairly recent choice of closed cell foam. I was quite interested in the foam until reading that supposedly it makes no difference at all regarding noise suppression. And after reading many topics on the subject of underlay I may not bother at all. I mean do we really want to quieten to noise? There's nothing wrong with the "clickerty-click in my opinion, it's just the mild roar of wheels rolling on metal that seem to offend most folk. My way of thinking at present is to lay the track straight onto the boards, and once the wiring is in place I want to try and fit some insulation foam to the bottom of the baseboards to try and stop the noise from reverberating out. I think the bottom of the baseboards are acting like a drum and up to 80% of the sound is exiting in that direction, but I maybe wrong time will tell. Any thoughts on this subject ? Martyn.