“The Sopranos” creator David Chase’s upcoming first feature may be more than just a movie. Its star, Jack Huston, says the band in the film — tentatively titled “Twylight Zones,” about a fictitious 1960s New Jersey group of the same name — continues to jam together after filming wrapped and may play some live gigs. “We still jam at [exec producer] Little Steven’s studio every week,” Huston said at an after-party for HBO’s “Boardwalk Empire” premiere. Huston, who was at the Waldorf with his Oscar-winning aunt, Anjelica, added that the band could “play a gig in Cannes,” depending on its festival-circuit plans.