Arc (1966) for organ and 4 soundtracks
Arc for organ and four electronic soundtracks 1966 was commissioned by the NCRV broadcasting corporation and realised in Ton Bruynel's private studio for electronic music. The electronic sound material is constructed as follows: white noise is transferred on to a metal string. The string responds by resonating and returns its own corresponding vibrations. The material obtained is then fed into a product modulator, a generator tone being added at the same time. The process releases sum and difference tones, which are fiItered and recorded on magnetic tape. The electronic part of Arc is transmitted through four groups of loudspeakers, set up in a hall (church) with an organ. The playback should be at the same volume as the organ. The organist can follow the electronic sounds in a score, playing his own part with the aid of an assistant. The titel Arc (arch) refers to the compositional technique in which the sound forms and structures are ‘stretched’ and ‘shrunk’. Especially the continuous sounds, being sober in movement, breathe in the time and dramatise the space. The electronic timbres coalesce with those of the organ or proceed from them. (from the score Arc, Donemus 1966)
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