I've built 4 layouts and on the last 3 I glued it down with a lot of wood glue. I used the other sheets as weight on top of the glued sheet and let the glue dry for a few hours. I also used cork roadbed on top of the homasote and I attached that with silicone caulk. That approach made less of a sounding board. In over 20 years I never had the homasote separate from the plywood.
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