This weekend brought a huge program to the Schnitz. Huge how? Well, first, in terms of a major new talent that is just beginning to be known here in America, the Latvian violinist Baiba Skride, playing the Tchaikovsky Violin Concerto. Second, the Walton First Symphony, a gigantic workout for the entire orchestra that makes a similarly large (read LOUD) sonic statement in its second performance in OSO history.