Understanding the ADSR envelope (shape): We are shaping our sound with attack, decay, sustain and release parameters.
Attack-Time:
This is the time we are taking from 0 to max. amplitude as soon as the key is pressed.
Decay-Time:
Follows directly after the attack time. Its the time the amplitude takes to go from maximum level to sustain level.
Sustain-Level:
This is the Level of amplitude we are keeping as long as the key is pressed.
Release-Time:
Starts as soon as key is released. Amplitude goes from sustain level to 0 - the release time sets how long this will take.
So, Attack, Decay and Release are time parameters. Sustain is a level parameter.
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