Modular touch sensitive keyboard modules

has anyone any idea how the Bob Moog’s Touch Sensitive E.G’s processed the C.V…?

I’m thinking it was basically a 911 where the signal level output was raised or lowered depending on the velocity of the modified keyboard…but there are other “enigmas” on the modules themselves i.e. percussion/sustain out… “hard” switches and so on.
(they are patched directly into filters and VCA’s )