Low Pass Gate
A version of the Buchla Low Pass Gate. This module includes Voltage Control of the Mode and Resonance amount. There is no switching to select mode. Voltage control varies the mode from VCA/VCF mode smoothly through VCF mode to highly resonant VCF.
http://clsound.com/vcresonantlpg.html
Module is available as a DIY project only.
No info about availability.