Do you have the schematic yet? If not, get it...it'll be crucial to any discussion of patch points.
Also, regarding CV for pitch, be aware that the main portion of the Polysix uses a scaling of 0.5 V / octave instead of the more typical 1.0 V / octave. This exponentially-scaled CV is used internally for master pitch control of all 6 voices together.
If you want to affect the pitch of the 6 voices individually, you have two choices. The easiest is that ou'd the 6 pitch CVs that go to the individual voice circuits. These signals come after the single exponential converter, which means that they are V/Hz.
Which you choose to do depends upon what you want to do.
Chip