What sets the Trautonium apart from other synthesizer is the vibrating tones it produces, because it had no keys to be played. It has a rich textured, deep sound, but the compositions that Sala made for them have a classical structure and are not at all abstract in one way or the other. It seems to me that Sala wants to prove one is able to compose 'real' music on an 'electronic' instrument. One can wonder if that is a discussion that is still relevant. If you don't wish to receive this, then let us know.
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