Available as an assembled Module and as a DIY project.
This Module is currently available.
Chainable Matrix Mixer
Chainable Matrix Mixer w/ alternate gain configurations and positive or negative mixing options.
Daisy modules can be chained together by patching the RGB outputs of one Daisy into the RGB CHAIN inputs of another Daisy module. The CHAIN inputs are mixed at the output either positively or negatively as chosen by the reverse-side jumpers. This expands the number of RGB matrixes for each successive chain.
*Current Consumption has been verified with the Joranalogue Test 3 V/mA Meter.
https://foxinghour.com/products/daisy-chainable-matrix-mixer
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These merchants probably sell this module. Huh?