eml synthesizers

I have never used an analog sequencer before bu I've already started to understand this. But I
was wondering what the V1, V2, V3 and V4 were. I can't seem to understand the function of
those and how they relate to the 401 either.

Also, there are two jacks at the bottom (one on each side) of the sequencer section with no
markings at all. Does anyone know what those are for?

Thanks!