In a cocktail shaker filled with ice, combine the Sour Mix, vodka, gin, tequila, rum and triple sec. Shake vigorously for 30 seconds and then strain into a highball glass filled with ice. Top with rose champagne, garnish with a lime or lemon slice and serve.
Combine the sugar and 1 cup water in a small saucepan and bring to a boil. Cook, stirring, until the sugar dissolves. Remove from the heat and let cool completely. Stir in the lemon and lime juice. Store, covered, in a glass or plastic container in the refrigerator for up to 2 weeks.