On my previous layout, I used pink insulating foamboard (R-3, 1/2" thickness). It worked well for absorbing the sound. Painting it required acrylic spray paint, as the latex paint didn't work well when I test painted a spot. The stuff I bought had a clear film over it that had to be removed before painting. If you go this route, leave the film in place while cutting the board to fit your layout, then remove the film before painting. It cuts easily with an x-acto style knife.
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