 This system was also easily capable of producing artificial reverberation or continuous sounds .At the premiere of Pierre Schaeffer's "Symphonie pour un homme seul" in 1951, a system that was designed for the spatial control of sound was tested.It was called a "relief desk" ("pupitre de relief", but also referred to as "pupitre d'espace" or "potentiomètre d'espace") and was intended to control the dynamic level of music played from several shellac players.