Darius Jones sits alone on stage minutes before tonight’s show at the Cunneen-Hackett Arts Center in Poughkeepsie, calmly detonating blasts from his alto saxophone, two-to-three second streaks booming across the theater and fading to a moment’s silence just in time for the next one. They’re foghorn loud, piercing, but they seem like more than mere warm up exercises. Perhaps he’s testing the structural integrity of the joint and/or mapping the room’s acoustics—gauging the capabilities of tonight’s worksite and the best ways to utilize them.