Great walk through. From 1968 to 1971.. i worked in an Equity summer theatre. I became the tech director.. i also acted & sang in shows.. 8 shows in 10 weeks is a grind .. what amazing equipment.. thatbthrust in the elevatir had me talking out loud.. and the sound booth was way ahead of the old reel to reel we used. Makes me feel very old! Dies anyone build a flat anymore? I bet they dont