This Module is currently available.
The Malekko Heavy Industry IMX is capable of both voltage inversion and utility mixing. The module is comprised of three voltage inverter channels, each wired to two sum outputs—one inverted and one normal. These outputs allow for the easy generation of adverse voltage motion ideal for pitch control or complex panning.
Includes 3 audio or DC inputs, 3 inverted outputs as well as an inverted sum and non-inverted sum outs. Invert waveforms, envelopes etc.
3×3 signal inverters
inverted and non-inverted sum/outputs
Audio and DC signal support
https://www.malekkoheavyindustry.com/content/uploads/2015/06/malekko-invertmix-manualv1.pdf
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These merchants probably sell this module. Huh?