A touring production of the musical Oliver! opened this week in California, with a machine in the orchestra pit and live musicians protesting outside the front door. As in similar disputes in New York, producers claim that the so-called “virtual orchestra” synthesizer is nothing more than a versatile new instrument which augments the sound of the show’s 10 live musicians, while the local musicians’ union claims that the Sinfonia, as it is known, takes jobs away from trained musicians.