Four Tet (a.k.a. Kieran Hebden) used everything lovable about experimental rock and electronic music to make one of last year’s most brilliant albums, “Rounds.” Here, Icarus remixes the album’s latest single, “My Angel…,” into something perhaps even more gossamer, and Hebden turns in two new abstract tracks. But the real treats on this CD/DVD double-disc EP are the videos. Of the four, including “As Serious As Your Life,” most notable are those by surrealist Japanese director Woof Wan-Bau. Magical and creepy, as surrealism is wont, his latest for “My Angel” brings out the dark side of this delicate tune.