Sustain  

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Train wreck at Montparnasse (October 22, 1895) by Studio Lévy and Sons.
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Train wreck at Montparnasse (October 22, 1895) by Studio Lévy and Sons.

In music, sustain is a parameter of musical sound over time. It denotes the period of time during which the sound remains before it becomes inaudible, or silent.

Sustain is the third of the four segments in an Attack Decay Sustain Release (ADSR). The sustain portion of the ADSR envelope begins when the attack and decay portions have run their course, and continues until the key is released. The sustain control is used to determine the level at which the envelope will remain. While the attack, decay, and release controls are rate or time controls, the sustain control is a level control.



Unless indicated otherwise, the text in this article is either based on Wikipedia article "Sustain" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on original research by Jahsonic and friends. See Art and Popular Culture's copyright notice.

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