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The Extended ADSR is a complex envelope generator that not only uses the four-segment envelope normally encountered in synthesizers, but is designed with extra features such as an initial voltage controllable delay time, voltage control of each segment, switchable slope forms, and a master voltage control.
Each segment may be manually set and voltage controlled. In addition to the normal Attach, Decay, Sustain, and Release segments, an Initial Delay time is included. A master 1V/OCT in/out allows to control all slope times for effects such as decreasing the entire envelope time as the pitch of an associated oscillator increases – a phenomenon is typical of many acoustic instruments.