Audio
Scherchen, Herrmann. n.d. “Der Einfluß Des Mikrophons Auf Die Tönende Botschaft - Side B”.
Text
Smith, Hermann. 1874. “On The Process Of Tone-Making In Organ-Pipes”. Nature 10 (259): 481-482.
Audio
Anonymous,. n.d. “Demonstrations Of The „Tonlagenwandler“ - Side A”.
Audio
Anonymous,. n.d. “Demonstrations Of The „Tonlagenwandler“ - Side B”.
Audio
Anonymous,. n.d. “Notes About The Transmission Of News - Side A”.
Audio
Anonymous,. n.d. “Notes About The Transmission Of News - Side B”.
Text
Springer, Anton. (1963) 1963. “Ein Verfahren Zur Sprachbandkompression”. Internationale Elektronische Rundschau 17 (9): 471-475.
Text
Anonymous,. 1961. “Gedruckte Schaltungen Für Neuartige Fernhörer Und Zur Steuerung Von Erdsatelliten”. Die Umschau In Wissenschaft Und Technik.
Audio
n.d. “Das Teilspektrum Der Glocke - Side A”.
Object, Instrument, Technology

The Sonde is a studio-oriented musical instrument designed by Canadian physicist Hugh Le Caine and built in the National Research Council of Canada’s (NRC) Electronic Music (ELMUS) Lab in Ottawa, Canada. It was created to facilitate experimentation in additive electronic sound synthesis. Unlike subtractive sound synthesis, in which a complex waveform is “shaped” by filtering or removing different frequencies, additive synthesis requires building up a complex waveform through the simultaneous introduction of multiple simple waveforms.