Whether as Fever Ray or with her brother Olof in The Knife, the Swedish electro-pop artist Karin Dreijer has always used alien-sounding music to evoke primitive human states. It isn’t just Radical Romantics’ metaphors that scan as sexual (the surrender of “Shiver,” the dominance-and-revenge fantasies of “Even It Out”); it’s the way their squishy synths and herky-jerky club beats conjure the messy ecstasy of our biological selves. And then there’s Dreijer’s voice, which through expert playacting and the miracle of modern technology creates a spectrum of characters, from temptress to horror-show to big daddy and little girl.