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
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Doepfer DOEPFER A-143-2 QUAD ADSR :
Doepfer A-140-2 Dual ADSR