On an early evening in September, a modest crowd entering the Dresher Ensemble Studio received disappointing news at the door: One of the two acts they came to see would not be performing. However, the show must go on, and the West Oakland Sound Series is no stranger to improvisation.  Matt Ingalls, Sound Series director, was not going to let his audience go without a second act. In the spirit of this avant-garde musical community, he would later join woodwinds…