Available as an assembled Module and as a DIY project.
This Module is currently available.
Geosync Series 1 - Envelope
A simple ADSR envelope based on the circuit in the Roland System 100M module.
The module has the usual gate control for trigger input, potentiometer controls for A,D,S,R and provides two (identical) envelope outputs and one inverted envelope output.
Not much more to say!
The module is available in black or white panels.