Orrego-Salas received commissions from the Koussevitzky, Coolidge, Kindler, Wechsler, Riley, and Stieren foundations; the Lousville Orchestra and the National Symphony of Washington. D.C.; Cornell, Miami, Trinity, and Santa Mara universities; the National Endowment for the Arts and the Inter-American Music Council in the United States; the Frei Foundation and the Colegio de Arquitectos in Chile, and numerous chamber music ensembles, soloists, and individuals.