Forget flares and cord fuses. Top firework-show designers use electronic igniters to trigger detonation. The latest hardware meshes perfectly with software. New this year from Infinity Vision of Bellevue, Washington, is Visual Show Director 4D (the fourth D is time), a WYSIWYG program with OpenGL runtime that allows designers to choreograph, score, and preview their shows on a computer before the real sparks fly. It’s not a fireworks show, it’s a pyromusical!