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Sine Wave A 440 Hz Concert Pitch for Ten Hours
Stop your brain from overthinking. You don't need an app. Ten hour Sine wave with no overtones which is called pure as it is only the fundamental frequency.
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Eight laser projectors are driven by random algorithms and the sound is generated with modular synthesizers in real time. No samples, no loops. Pure math, code, and electric signals. Presented at Intervals Festival, Nizhniy Novgorod, Russia, December, 2019.