When not leading the 17-piece Big Soul Ensemble, the Soul Jazz Revival group or the New Orleans-style Mohawk Brass Band, bandleader, educator and alto saxophonist Keith Pray fronts a hard-swinging quartet performing at venues in Albany and throughout the Capital District of upstate New York. Confluence is his fifth recording as leader, a project he designed for his working quartet but modified with the addition of guitarist m: Chuck D’Aloia, an idea that remained percolating after seeing a 1994 gig of the m: Joe Henderson trio with m: John Scofield as the fourth player. The result, of course, is the perfect gathering necessary for the Confluence of a well-designed and appealing musical endeavor…