Lesson 9 — ADSR Envelopes
Attack, Decay, Sustain, Release. Four letters that control time itself.
The Envelope Filter — ADSR
An envelope shapes how a sound evolves over time. Every synth, sampler, and effect uses one. Grab the controls below, press a key, and listen to how Attack, Decay, Sustain, and Release sculpt the sound.
Click keys or use computer keys A S D F G H J K L ; ' (C4 to B4).
What each knob does
Attack — how quickly the sound rises from silence to full level. Turn it up for swells and pads; keep it short for drums and plucks.
Decay — how quickly the sound falls from its peak to the sustain level. Short decay sounds like a percussion hit; longer decay feels more like a bowed string.
Sustain — the level the sound holds while you hold a key. Set it low for stabs, high for organs and pads.
Release — how long the sound lingers after you let go. Long release creates smooth tails and reverb-like decays; short release chops the sound off instantly.
Waveform
The waveform is the raw shape of the sound wave. It determines the harmonic content and brightness before the envelope even starts. Sine is pure and smooth; triangle is soft but brighter; square is hollow and buzzy; sawtooth is bright and aggressive.
🎧 Monakai Pro Tip
In sound design, the envelope is the first thing I reach for. A slow attack turns a pluck into a pad; a fast release turns a pad into a stab.
Key Takeaways
- ADSR stands for Attack, Decay, Sustain and Release.
- Attack controls how quickly a sound starts; release controls how it fades.
- Envelopes shape every synth sound and can also modulate filters and effects.
- Short attack sounds punchy; long attack sounds soft and swelling.
Practice This
Open your DAW and apply one idea from this lesson to a 16-bar loop. Don't worry about making a full track — just experiment until the concept feels natural in your hands.
Try Monakai's free VST3 plugins to hear these ideas in action, and check the music production blog for more tips.