We output Proclaim to an Apple TV unit connected to the projector and the sound system. This has worked OK for several months. Last Sunday, we tried to play a video inserted into Proclaim. It was epic except it had no sound. Play the same clip using the Quicktime player in the same configuration and its great....and has sound. Right now, no video clips have sound coming out of Proclaim. I don't see an obvious setting (something like Audio Output for example) to toggle and get things working again. On "Vintage" Sunday, the silent movie would have been a hit....last Sunday, not so much.