Dub reggae messes with sounds through addition, subtraction, distortion, and sudden shifts. On 2011’s Harmonic Emergency, Andre Afram Asmar takes those tendencies and expands upon them, creating tracks that rattle and hum with a variety of tones and human utterances. Things can get pretty dense, creating music that might be called clutterdub, while at other times it’s hard to categorize the tracks. Asmar often incorporates vocals or instrumental flavors redolent of the Middle East, but it’s hard to anticipate what ingredients he might stir into his rich sonic stews. The opener, “We Want U 2 Know,” flutters with energy. You get the sense that a big beat is about to kick in, but it never does: instead, an atmospheric tension is maintained throughout. “Onward Farword” charges ahead as synth lines cut through the air and percussion makes a welcome racket. Singing echoes over rub-a-dub flow on “Spirit Guides,” while melodica riffs and loads of details brush up against each other on “Grace from the Bottom.” Wooly vocals, fine bass, and spitting beats mark “Dark Found Light,” which might be the best cut here.