Dual ADSR Envelope Generator
X-Fade Modular are all handmade manufacturers.
Basically it sells only in Japan.
In some countries you can purchase from the following LINK.
https://reverb.com/item/10592930-x-fade-modular-adsr-2
http://txfade.ec-net.jp/modular/004adsr2.htm
This Module is currently available.