ADSR

Parameters

Name	Type	Description
Valueoutput	Float	The level of the envelope, between 0 and 1.
Doneoutput	Trigger	Fires when the release has finished and the level is back at 0.
Gate	Bool	Holds the envelope open for as long as it is on.
Trigger	Trigger	Plays the envelope once, as if the gate were held on for the trigger length.
Trigger Length	Float	How many seconds the gate stays on after a trigger.
Attack	Float	How many seconds the level takes to rise to 1 after the gate goes on.
Decay	Float	How many seconds the level takes to fall from 1 to the sustain level.
Sustain	Float	The level held for as long as the gate stays on, between 0 and 1.
Release	Float	How many seconds the level takes to fall back to 0 after the gate goes off.
Curve	Enum	The shape of each rise and fall.Choices: Linear, Exponential

ADSR shapes a level over time in the way a synthesizer shapes a note. When the gate goes on the level rises to 1 during the attack, falls to the sustain level during the decay and stays there for as long as the gate is held. When the gate goes off the level falls to 0 during the release, and Done fires when it gets there. Between notes the level is 0.

The trigger plays the envelope without a gate. It holds the gate on for the trigger length and then lets it go, so one trigger gives one complete rise and fall. A gate that is turned on during a release, or a trigger that arrives while the envelope is already playing, starts a new attack from the level of that moment. The level never jumps.

Linear moves at a steady pace. Exponential moves fast at first and slows down towards the end, which sounds and looks more natural.

A usual setup is a Beat on the trigger and the value on the brightness or size of something, so it flashes on every beat.