Trautonium
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The trautonium is a monophonic electronic musical instrument invented ca. 1929 by Friedrich Trautwein in Berlin. Soon Oskar Sala joined him, continuing development until Sala's death in 2002. Instead of a keyboard, its manual is made of a resistor wire over a metal plate which is pressed to create a sound. Expressive playing was possible with this wire by gliding on it or create vibrato with small movements.
Paul Hindemith wrote several short trios for three Trautoniums with three different tunings: bass, middle, and high voice. One of the first additions of Sala was to add a switch for changing the static tuning. Later he added a noise generator and an envelope generator (so called 'Schlagwerk'), formant filter (several bandpass filters) and the subharmonic oscillators. These oscillators generate a main pitch and several harmonics, which are not multiples of the fundamental tone, but fractions of it. Four of these waves can be mixed and the player can switch through these predefined settings. Thus, it was called the Mixtur Trautonium. Oskar Sala composed music for industrial films, but the most famous was the noises for Alfred Hitchcock's The Birds.
The German manufacturer Doepfer sells some devices for the commercial market to allow for Trautonium-like synthesizer control.
