This Module is currently available.
Envelope Generator (EG) with AS3310 Architecture
Featuring the AS3310 IC (based on the classic CEM3310 IC), the 3310 Envelope Generator (EG) offers a simple, but effective four-stage design; ideal for modulating VCAs, filters and other modules.
Features
https://www.wavefonix.com/product-page/3310-envelope-generator
These merchants probably sell this module. Huh?