The Trautonium History: The Beginning Neumixturtrautonium VST Oskar Sala, My Fascinating Instrument. 1990 recording (Erdenklang 90340) Perfect Sound Forever, Oskar Sala 1910-2002. Website Plasma Speaker Wolfgang Müller Pablo Freire (2003). Oscar Sala biography (in Spanish) The Trautonium the Trautonium on '120 years Of Electronic Music' Electronic musical instruments Continuous pitch instruments