“Noises Off,” written by English playwright Michael Frayn, is about a group of actors rehearsing “Nothing On,” a sex farce, in which the cast is faced with the worst-case scenarios backstage. The season opener also marks a new era at the Old Town Theatre as Cygnet makes the venue its permanent home. A capital campaign brought in more than $1 million for the transition and an upgraded sound and lights system, giving the sixth-year company a “top-of-the-line infrastructure,” said Murray, Cygnet’s co-founder and the director of “Noises Off.”

