Understanding the ADSR envelope (shape): We are shaping our sound with attack, decay, sustain and release parameters.
This is the time we are taking from 0 to max. amplitude as soon as the key is pressed.
Follows directly after the attack time. Its the time the amplitude takes to go from maximum level to sustain level.
This is the Level of amplitude we are keeping as long as the key is pressed.
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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