On the seventh volume in the On-U Sound label’s Pay It All Back series, we get previews of upcoming releases, obscure early tracks, new mixes, and other odds and ends — all of which showcase not only producer Adrian Sherwood’s uniquely wild and expansive sonic vision but also his ability to entice a wide variety of vocalists and musicians into his studio. Proto-grime kingpin Roots Manuva joins forces with bassist Doug Wimbish; Los Gaiteros de San Jacinto bring some dubbed-up cumbia; Congo Natty brings the jump-up junglism; and so forth.