#visual synthesisers

[tartyfart]

Spectrogram (1959), Hugh le Caine

The Spectrogram, shown here as it was in 1966, was used to control the output of the Sine bank, or the Multi-track (Special Purpose) Tape Recorder. The chart paper moved past a series of light sensitive switches and was illuminated by the light above the instrument. When the light was blocked by a darkened area of the paper, the sound generator would be turned on.