> What is the A-117 CV response like Is it vaguely exponential linear

The A-117 has no CV input !

> Is this a Shift register based noise circuit where the CLOCK is under VC

No, you only have a clock input and can use e.g. a VCO or HSVCO (e.g. from
one of the BBD modules) as VC clock source.

Best wishes
Dieter Doepfer