This Module is currently available.
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
Cwejman ADSR-VC2 Dual VC Transient
Doepfer A-143-2 Quad ADSR
Doepfer A-143-2 Quad ADSR
Doepfer DOEPFER A-143-2 QUAD ADSR :
Doepfer A-143-2 Quad ADSR Envelope
Doepfer DOEPFER A-140-2 DUAL MINI ADSR