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I don't know if Sala is playing a Mixtur-Trautonium on this but... "In 1930, Dr. Friedrich Trautwein invented the Trautonium, the only instrument in the world capable of producing subharmonics, which are the mirror opposite of harmonics, or 'ghost' note like playing a string on a violin only half held down. Oscar Sala, a young student of Trautwein's, pioneered the development of the instrument and made the Mixtur-Trautonium, an improved polyphonic instrument which was used in the soundtrack of Alfred Hitchcock's film The Birds, as the instrument sounded more ominous than the sound of real birds. The Trautonium has advantages over a synthesizer giving freedom of intonation like a fretless string instrument to play microtones and continuous, unrestricted variations of pitch, tone and volume. The player makes contact with a wire stretched over a metal strip to create a circuit. It was a forerunner to the modular synthesizers of the 1960s. Nearly all knowledge of the performance and workings of the Trautonium has died with Oscar Sala in 2002, but the album My Fascinating Instrument, which is available today, is testament to Sala's musical genius." Thanks: http://whatsinmyipod.blogspot.com/2008/01/oskar-sala-my-fascinating-instrument.html