Curve (Delay) - the amount of time between the note-on event and the start of the attack segment. Delaying the appearance of sound after a key-press is especially important in ambient music, where the musician can use this time to adjust the timbre parameters. We can control the length of this delay.
Attack - the initial portion of every envelope after a note-on event. In this segment the value is rising from the minimum envelope value to the maximum envelope value. When we “control the attack” we change the duration of this segment.
Hold - A segment where the envelope value is at its maximum; by controlling its length, we adjust how long will the controlled parameter be at its peak value.
Decay - The segment where the envelope falls from the peak value to the initial sustain value. We can control its length.
Sustain - The segment where the envelope maintains a constant level until a note-off event. We set the value of this level but its length is controlled by the performer.
Release - The final segment of any envelope, where the value falls from its current value to 0.