After 44 years of trying, they finally found a way to warm the Berkeley Art Museum and Pacific Film Archive on a Sunday afternoon — combine 600 people and 100 ticking metronomes on the concrete floor. The tick-tick-ticking was like a time bomb in the old concrete bunker, and when the last one had wound down and quit, everybody fled the building for a New Orleans-style parade to the BAM/PFA’s new home in a printing plant at the more densely traveled west entrance to campus. What it was not suited for was welcoming passersby to stop in for the visual arts. The exterior has always been a problem,’ said Noel Nellis, chairman of the museum’s Board of Trustees. People are the missing ingredient, director Larry Rinder added as he looked down on a packed floor, then looked up on packed ramps and overlooks rising to the skylights. “I was like, 'Oh, my God, how come I’ve never seen this before?’” she said, while standing on the top tier. A lot of people were, maybe more than regular attendance figures would have suggested, so composer Sarah Cahill conducted György Ligeti’s “Poème Symphonique” for 100 metronomes as a lovely way to end. On cue, a brass band gathered at the entryway banged into a rendition of “I’m Walking,” and that’s what they did, Rinder in the lead with his giraffe, and maybe 200 people marching behind. Standing on the sidewalk at Center and Oxford streets, they lifted a toast of hot cider as spotlights played off the metal skeleton of what will become their new home, just up the block from the Downtown Berkeley BART Station.