This Module is currently available.
Quad 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/11036934-x-fade-modular-adsr-4
3 Users are observing this
Doepfer A-141-4 Quad Poly VC-ADSR