This was the third and final concert of The Knights’ residency at Zankel Hall this year, and Heirloom, of which the orchestra was a co-commissioner, was receiving its pandemic-delayed New York premiere. Heirlooms is a three-movement work on themes of intergenerational inheritance, with one movement based on the entangling of Gabriel Kahane’s parents’ musical lives and his own, one on his grandmother’s post-war feelings about German music, and the third on the unknowable question of what his children will inherit from him.