GRJ is correct as always. The only thing better than Baltic birch is appleply. ( both stay flat ) If you listen to a person who builds violins and guitars they will tell you that sound travels with the grain and therefore the thinner and higher count ply helps reduce sound travel because of the way the plies are cross laminated. The sound difference between 3/4” and 1/2” is negligible. If you really want a quiet layout place convoluted acoustic foam underneath the layout. If you don’t know what that is, look it up.