This is an ADSR envelope generator module that can be used to modulate any other parameter.

Is based on the code by Will Pirkle from his Synth Book.

Example

import { AdsrEnv } from "synthlet";
 
const adsr = AdsrEnv(audioContext, {
  attack: 0.1,
  decay: 0.1,
  sustain: 0.5,
  release: 0.1,
});
const filter = Svf(audioContext, {
  frequency: 440,
  Q: 1,
  type: "lowpass",
});
adsr.connect(filter.frequency);

Parameters

• attack: The attack time in seconds. Default is 0.1.
• decay: The decay time in seconds. Default is 0.1.
• sustain: The sustain level. Default is 0.5.
• release: The release time in seconds. Default is 0.1.
• offset: The start offset. Default is 0.
• gain: The gain. Default is 1. It is the maximum amplitude after the attach and affects the sustain level. For example, a gain of 100 and sustain of 0.5 will make the sustain level to be 50.