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Designing Software Synthesizer Plug-Ins in C++ by Will Pirkle

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Chapter 6Envelope Generators and Controlled Amplifiers

Envelope Generators (EGs) are used to shape the amplitude, pitch, and frequency domain content of the synthesized signal. The three applications are usually called Amp-EG, Pitch-EG, and Filter-EG, respectively. In this chapter we will investigate and code an envelope generator that will provide the basic functionality we need for all three applications. An Amp-EG is referred to as a Transient Generator (TG) on older synthesizers. The transient generator shapes the time domain or transient edge of the signal. The Amp-EG is applied to a controlled amplifier. In analog synths, this is a Voltage Controlled Amplifier (VCA) whereas on a digital synth, this is a Digitally Controlled Amplifier (DCA). ...

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