The envelope generator modulates the filter cutoff frequency over the course of a note duration. The modulation intensity and response to velocity information is set with the ADSR via Vel slider in the Filter section.
Set the modulation range with the two arrows on the ADSR via Vel slider.
The lower arrow indicates the minimum amount of modulation.
The upper arrow indicates the maximum amount of modulation.
The blue bar between the arrows shows the dynamic range of this modulation. You can simultaneously adjust the modulation range and intensity by dragging the blue bar.
Tip: If you’re unfamiliar with these parameters, set the Cutoff parameter to a low value, Resonance to a high value, and move both ADSR via Vel arrows upward. Constantly strike a note on the keyboard while changing the arrows to learn how these parameters work.