Volti, the chamber chorus that continues to do fine work with the music of living composers, is finishing up its season with a new piece, “From Ivory Depths,” by composer Tonia Ko. Born in Hong Kong and raised in Honolulu, Ko is a visual artist as well as a composer, and her new work takes its inspiration from the writings of Virginia Woolf. First Unitarian Universalist Center, 1187 Franklin St., S.F.