It did not start as a critical edition, but after heavy criticism of the first volumes, which were performing editions without a critical apparatus (for example, the opera Serse was published with the title character recast as a tenor, reflecting pre-war German practice), it repositioned itself as a critical edition.
Non comezou como unha edición crítica, mais despois de fortes críticas aos primeiros volumes, que foron realizados sen apartados críticos (por exemplo, a ópera Serse foi publicada co papel protagonista reformulado como tenor reflectindo a práctica da Alemaña anterior á guerra), reformulouse como edición crítica.