Walter Merlin Jones is a perfectionist. A presence in the house scene since the late ‘80s, the DJ and producer has, over the years, created thousands of undoubtedly wonderful, but unfinished, songs – a staggering collection of musical bits that have fallen victim to his tendency to be his own worst critic. Yet, that same perfectionism has yielded some of the most engaging dance music of the last decade, however scant – songs that are aural proof of his preference for quality over quantity. Jones’s first DFA release, 2009’s “I’ll Keep On Loving You/Living Without Your Love,” confirmed his commitment to this idea with subtle grace and slow, seductive rhythms. Now, with Graceful Exit – which pairs Jones’s talents with singer Ellipsis, Boston producer Chas Bronz and saxophonist Jesse Allen — the New Orleans-raised artist continues to showcase his discerning ear, proffering music with a modern, evolved take on disco’s very best virtues.