An envelope generator is a component in synthesis that shapes the amplitude of a sound over time, typically controlling how the sound evolves from the moment a note is played until it stops. It defines key aspects of a sound's dynamics, such as attack, decay, sustain, and release (ADSR), which are crucial for creating expressive sounds in various synthesis methods. Envelope generators can be found in subtractive synthesis, integrated into analog synthesizer architecture, and utilized in various forms of synthesis like FM and additive synthesis.
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