Konrad Becker's work as a sound artist and composer is mostly known for his pioneering achievements in electronic music under the name Monoton. Until this day documents of his acoustic works remain extremely rare. The pieces for 4 painos remain a central element in his oeuvre and it is for the first time that these historic recordings are made available. Recorded in 1982-83 for the international performance series "Program for the 100% resocialization of the devil" and the "Parzival" opera in May 1984. Three previously unpiblished "Zero Oxygen" tracks contrast the almost 30 year old analogue sound documents. In 2002 the piano pieces for mechanical instruments were amended by a digital postscript of virtual grand pianos.