Like Whitman, Pamela Z contains multitudes: her multimedia works (which she controls with an onstage Powerbook, along with BodySynth technology, which allows her to manipulate sounds with physical gestures) combine real-time sound processing, multitrack layering, text sampling, and video projection. But at the center of it all is the simple beauty of her classically trained voice—which can give her work an almost medieval purity. “Voci,” a polyphonic one-woman opera, explores the nature and possibilities of the voice itself in a series of interrelated vignettes. (The Kitchen, 512 W. 19th St. 212-255-5793. Oct. 28-30 at 8.)

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