Thanks Chuck! I looked at some *Sound Board* at Lowe's and it seems fine @ 1/3 the price of Homasote. It's sugar cane fiber and looks like dirt. I understand it's acoustical properties are minimal but that's not why I'm installing it. I want the deck to be a somewhat forgiving i.e., *not hard*. It will sit inside the trim of the bench work so it won't be glued or otherwise attached to the plywood. Hopefully, I have the bench-work done by next week 9/9-9/10 or so...and, ready for the sound board.
Comments please...