ADSR

ADSR stands for Attack, Decay, Sustain, Release — the four stages of a sound envelope commonly found in synthesizers. ADSR shapes how a sound evolves over time — it’s an essential tool in sound design.

• Attack: how long it takes for the sound to reach full volume after a note is pressed.
• Decay: how long it takes to drop from the peak to the sustain level.
• Sustain: the level maintained while the note is held.
• Release: how long it takes for the sound to fade out after the note is released.