Preheat oven to 375 degrees. Wash tube pan in soapy water to ensure it is totally grease free. Let dry completely. Sift flour and 3/4 cup confectioners sugar together three times; set aside. In mixing bowl, beat egg whites and salt on high speed until foamy. Add cream of tartar, 1 teaspoon vanilla, and almond flavoring; beat until soft peaks form. Gradually add 1 cup white sugar, continuing to beat until stiff peaks form. Sift about 1/4 of the flour mixture over the egg whites and using flat spatula, quickly but gently fold into egg whites. Repeat using 1/4 of flour mixture each time. Pour batter into clean tube pan. Gently cut through batter with knife to remove air pockets. Bake for about 30-35 minutes, until an inserted toothpick comes out clean. Invert pan onto a wire rack to cool for 1 hour.
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