Available as an assembled Module and as a DIY project.
This Module is currently available.
Quad Buffered Attenuverter
Prototype of DIY module from Neutron Sound
A Quad Buffered Attenuvertor with selectable lin / log_antilog response.
Module has Pre & Post mix out of Channels 1 to 4
Channels 1&2 have dual buffered outputs
https://michigansynthworks.com/products/neutron-sound-qat-quad-attenuverter
2 Users are observing this
These merchants probably sell this module. Huh?
Neutron Sound QAT, 8HP Quad