1. Heat oven to 350°F. Grease and flour 12-cup fluted tube pan.
2. Beat butter and sugar in large mixer bowl until light and fluffy; blend in eggs and vanilla. Combine flour, 1-1/4 teaspoons baking soda and salt. Stir together buttermilk and caramel syrup; add alternately with flour mixture to butter mixture. Remove 1 cup batter and place in small bowl; pour remaining batter into prepared pan. Stir chocolate syrup, cocoa and remaining 1/4 teaspoon baking soda into reserved 1 cup batter; pour over batter in pan. DO NOT MIX.
3. Bake 1 hour and 5 minutes or until wooden pick inserted in center comes out clean. Cool 15 minutes; remove from pan. Cool completely. Dust with powdered sugar and serve drizzled with additional caramel and chocolate syrups. 12 to 16 servings.
* To sour milk: Use 1 tablespoon white vinegar plus milk to equal 1 cup.