AudioProcessing.Compute.Generate.Envelope

This node creates an envelope signal $\mathrm{A}[n]$ for shaping a sound signal $x[n]$ over time, e.g. for the simulation of a key press on a piano. To this end, the sound signal $x[n]$ is typically multiplied with the envelop $\mathrm{A}[n]$:
$x'[n] = \mathrm{A}[n] \, x[n]$
The parameters attack time, decay time, sustain level, sustain time, and release time control the shape of the envelop:
envelop_generator
$A[n]$
$n$
Attack
Time
Decay
Time
Sustain Time
Sustain Level
Release Time

AudioProcessing.Compute.Generate.EnvelopePercent

This node produces the same envelope signal $\mathrm{A}[n]$ as the node described above but attack time, decay time, sustain time, and release time are given as percentages of the total envelope length.