Dot Matrix

Graphical sound is an early electroacoustic technique and aesthetic in which audio is generated from drawings, stencils, or photographed shapes placed on optical film soundtracks. Instead of recording a vibrating source with a microphone, composers directly designed waveforms and spectra, then scanned them with optical readers to produce sound. Emerging in the Soviet Union and Germany, practitioners treated sound as visible geometry: curves set the waveform, patterns set the spectrum, and motion through time created phrasing and rhythm. The result ranges from pure tones and microtonal glissandi to dense, noise-like textures—predating and foreshadowing later tape, electronic, and spectral practices.