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My take on it would be to look at a Happy Nerding 3x VCA, actually. This would give you the CV mixing, attenuverting, AND three linear, DC-coupled VCAs to have CV over your modulation, etc levels. Drops right into that 6 hp hole, too. And if needed, you can split out one or all of the VCAs. The Frap 321 is also a good drop-in choice...it all depends on how you want to do your CV/mod mixing and control and how much control you want vs. what you want the synth to have control over.