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sustain
In music, sustain is a parameter of musical sound over time. As its name implies, it denotes the period of time during which the sound remains before it becomes inaudible, or silent.
Additionally, sustain is the third of the four segments in an ADSR envelope. 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.
==Differences==
Drum percussion instruments are usually the instruments with the shortest sustain; a drum beat begins to fade almost instantly. Instruments with the highest possible sustain often involve the passage of air, such as brass or the pipe organ, which have theoretically unlimited sustain. Feedback created using the Larsen effect also provides virtually unlimited sustain, but only to electronically amplified instruments. Resonating instruments such as the piano and guitar also have fairly long sustain for string instruments.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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