Available as an assembled Module and as a DIY project.
This Module is currently available.
ADSR
https://frequencycentral.co.uk/product/system-x-envelope/
1 Users are observing this
These merchants probably sell this module. Huh?
Included in 65 Racks, 26 are public:
EarthQuaker Devices Acapulco Gold V2
EMG 35CS
Samson Expedition XP800 8-channel 800W
EI 12AX7/ECC83
Analogman Peppermint Fuzz
Multiple Telecaster Pickguard