This Module is currently available.
Four stages envelope generator
Grp’s ADSR module is a classic envelope with attack, decay, sustain and release phases. Three time ranges are available (slow, medium, fast). Thanks to a Thru socket, incoming gate signals can be passed on to other modules. Furthermore, there are positive and negative outputs.
http://www.grpsynthesizer.it/index.php/it/prodotti-it/eurorack-grp-it/eurorack-grp-adsr-it.html
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These merchants probably sell this module. Huh?