I attended the formal debut-again concert of the Puget Sound piano trio last Friday not quite knowing what to expect. The trio is a resurrected version of that which used to play regularly at the University of Puget Sound, and two of the players – the late Ed Seferian on violin and the recently retired Cordelia Wikarski-Miedel on cello – have just been replaced by violinist Maria Sampen, who filled Seferian’s position as associate violin professor, and cellist David Requiro, made artist-in-residence last August. Pianist Duane Hulbert is the sole continuing member. It’s a good and vital thing for …