Available as an assembled Module and as a DIY project.
This Module is currently available.
Resonant Low Pass Gate with a twist
What is to say about the RLPG, well it is an LPG with resonance. LPG's are famous for their bongo sound when triggered. You can put any sound into it and then send voltages, triggers in the available inputs. This mmodule likes you to experiment with it.
It includes Voltage Control of the Pre-VCA, Post VCA and Resonance amount. There is a switch to select mode High or Deep sound.
Also, regarding the VACTROLs, you can use Xvive or Chinees copies, all works but different flavours.