Available as an assembled Module and as a DIY project.
This Module is currently available.
6 in 6 out Voltage Controlled Matrix Mixer
The AI028 Voltage Controlled Matrix Mixer is a 6-input, 6-output Matrix Mixer, with 36 Linear VCAs to control how much each input is fed to each output (0-5V). The Module can distribute audio and/or control voltage, and has a dedicated 5V output for use with passive or active attenuators for manual volume control.
https://aisynthesis.com/product/ai028-voltage-controlled-matrix-mixer/
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These merchants probably sell this module. Huh?
AI Synthesis AI028 Voltage Controlled
AI Synthesis AI028 Voltage Controlled