In a large bowl. combine butter and 3/4 cup powdered sugar until light and fluffy. Beat in orange peel and extracts. Combine flour and salt gradually to creamed mixture and mix well. Stir in nuts. Shape into 3/4-inch balls. Place 1-inch apart on ungreased cookie sheets. Bake at 350 degrees for 10-12 minutes or until bottoms are lightly browned. Remove to wire rack and cool completely. Place remaining powdered sugar in a plastic bag. Add cookies a few at a time, and coat with powdered sugar. Makes about 3 dozen.