Sly Dunbar is perhaps best known as the “drum” half of original D&B gods Sly & Robbie (whose credits are too numerous to mention). Pressure Sounds’ latest excursion into dubwise version helps explain how Sly (leader of The Revolutionaries) became a deity of riddim-given free reign to tinker and experiment with his sound at the legendary Channel One studio, he did the damn thing. Old-school dub albums are no mystery: They work best when they’re thick, heavy, and dry. Drum Sound offers no real surprises for seasoned echo heads, just killer dubs of 16 classic Channel One tracks.