Infra Boston, the party series helping shape the course of Boston’s underground scene, bring their curatorial lens to Signal for a night of shape-shifting techno. Opening the night is techno duo Rush Plus who come packing industrial-tinged rhythms and minimalistic club sounds for a set that heaves with tension and momentum. The vibe is set then for long-standing techno icon Dustin Zahn to deliver his signature blend of precision and heft, tightening the atmosphere though measured ars of controlled propulsion, luring the room into a delirious, catatonic state. Shutting it all down is Infra-affiliate Annie Lew whose patient selections and spacious, elastic rhythms guide the floor through a final stretch of clarity and release.