In the bowl of a stand mixer fitted with the paddle attachment, beat butter and salt at medium speed until smooth and creamy, 1 to 2 minutes. With mixer on low speed, add confectioners' sugar, 1 cup (120 grams) at a time, alternately with cream and extracts, beating until combined after each addition and stopping to scrape sides and bottom of bowl. Increase mixer speed to medium-high, and beat until pale and fluffy, 1 to 2 minutes. Use immediately.