In this Bitwig Grid walkthrough, the host adds a dedicated filter envelope generator alongside the main amplitude envelope to dynamically shape a low-pass filter's cutoff frequency. Routing a separate AR envelope to the filter's cutoff input and adjusting an attenuator gives the filter sweep its own independent control, separate from the envelope shaping the volume.
The key insight is about timing relationships between the two envelopes. Since the filter is only audible while the amplitude envelope is open, the filter release can be kept shorter than the amplitude release, letting the cutoff sweep close before the note fades out. Slowing the filter attack while keeping the release snappy is a reliable way to get a sharp, characteristic sweep without the filter tail getting buried.