Hazan David Lipp had been looking forward to hearing the voices of his congregants at this year's High Holiday services. Last year, during the pandemic, his congregants attended shul virtually -- from home, on mute -- while he sang to an empty sanctuary. The choir at Congregation Adath Jeshurun, the 420-family Conservative synagogue in Louisville, Kentucky, where Lipp is cantor, was also hoping to perform before a live audience; last year they prerecorded a video for services, but this year they had masks custom designed for singing, which they planned to use as part of their return to in-person services. For months, the synagogue's clergy, staff, and lay leaders had been conducting online video calls with a panel of physicians to determine how to reopen safely.