The sound effects of this study are obtained starting from various materials alternatively tended and slackened in front of the microphone. They appear in the form of rhythmic structures sometimes very dense, sometimes very untied whose dynamic origin is perceptible. Thus the sound dash, unceasingly broken, creates a surprise, which was not required as such, and becomes an element of the organization

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The Etude aux sons tendus is one of my first experiments of concrete music, also this piece seems to me filled of awkwardnesses today. My principal curiosity, by composing it, was the rhythmic possibility that the magnetic tape allowed, as well by sound cutting as by the natural movement of the employed objects, and also their superposition.