The envelop of a sound describes the way the amplitude varies over time. How it gets louder & softer overtime. The envelop is mostly divided into 4 sections – Attack, Decay, Sustain, Release. Combinedly named ADSR. Together, they make up the ADSR envelope. An ADSR envelope determines how a sound unfolds over time.
Reverb is created when a sound is reflected causing numerous reflections to build up and then decay as the sound is absorbed by the surfaces of objects in the space with every surface—hard, soft, tall, short and everything in between. Without that sense of space sounds often seem unnatural, thin, or hollow. Reverb effect creates a variation in music.
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