The Gravesend Inn is a high-tech haunted hotel which we do at City Tech as our annual, major Fall production. The audience, while unaware, actually runs the entire attraction. I designed the Inn's show control system , and oversee the audio and video system engineering. NY1 has a very good segment about the show that you can view here. A somewhat out of date article I wrote for Lighting and Sound America about the technology is here; an older dorkbot presentation I did on the technology is available here; updates via blog entries are available here.