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[[File:ADSR parameter.svg|thumb|300px|The amplitude over time of an ADSR envelope. Only the positive half of the signal is shown.]] Sound synthesis techniques often employ an '''envelope generator''' that controls some parameters of a signal or control voltage at any point in its duration. When it controls a [[VCA]] these together form an '''envelope shaper'''.<ref>''Synthesizers for musicians'' by R A Penfold, PC Publishing, 1989, ISBN 1870775015, p.21</ref>
== Timbre ==
ADSR envelope generators can be used for various functions. The most important use is to give timbre to a sound. Timbre is what makes one instrument sound distinct from another, even when playing the same note and at the same volume.
==ADSR==
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