This Module is currently available.
ADDAC807C Individual Channel Stereo Outputs Expansion
Dedicated expansion for the ADDAC807C VC Summing Mixer
Features 4 individual track post fader stereo outputs.
https://www.addacsystem.com/en/products/modules/addac800-series/addac807c_313
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These merchants probably sell this module. Huh?
ADDAC System ADDAC807C VC Stereo Mixer