Nine years after putting the voices, sounds and atmosphere of the UK dance scene to music on his solo debut album, London’s Jamie xx is back with a new album, “In Waves” – out on Friday. “I wanted it to feel like one of my DJ sets, more reflective of a party that I would throw,” says Jamie Smith, who adopted the last two letters of his stage name from The xx, the indie band with which he first gained fame. Indeed from the first minute it does feel like the bouncer has just waved us through into the club. In 12 tracks, the record gives you the feeling that you could just as easily be on the dan…