Jazzstep is Jungle after it found a dinner jacket, a brass section, a drummer that could suffer more tastefully, and a woman who can actually sing over the chaos. The breakbeats still twitch like they drank six espressos and heard bad news, but now there’s a saxophone smoothing the crime scene and a double bass pretending this whole thing has table manners. It’s not rave music so much as Jungle, maybe it’s for people who own wine glasses and say “arrangement” without irony. Jazzstep is proof that even a nervous breakdown sounds respectable with enough horns.