sentences:  He conducts the group with his specially developed system of hand signals so that he can not only designate time and intensity but also timbrical and spatial options.The members of the ENS are composers as well as musicians and thus could effectively respond to these directions.They have played in a number of Edelstein's acoustic theatre works, including the first part of the trilogy La Teoría Sagrada del Espacio Acoustico – Libro I (2000–2001); Klange, Klange, Urutau (1997) − described by Clarín's music critic Federico Monjeau as "an hour of music without interruptions, and without a moment of weakness"; and El Hecho (1998) which Monjeau called "a profound theatrical idea and fascinating music."