Hi Tony,

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

linear

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

under VC

Yes, the A-117 produces a simple shift register sequence, but no, it
is not under voltage control. Thus there is no 'CV response' to talk
of.

With nothing plugged into the 'ext clc' socket, the register is
clocked by an internal oscillator, which is controlled manually by
the pot on the front. If you don't want to use this, then you can
plug an external oscillator in, so if you want voltage control, use a
VCO - the response then will by whatever the response of the VCO is.

For the internal oscillator, the rate pot is perhaps reverse from
what you'd expect: low knob settings give a fast clock (max f on mine
approx, 68kHz); turning clockwise to higher settings slows the clock
down (min f on mine, approx 90Hz). The pot is actually a log pot
(taper 'A'), and so the high frequency drops off rapidly from knob
setting 0 to about setting 2 (where it is approx 3kHz), and then much
more slowly down to the minimum at setting 10. (I did plot a very
rough graph, but it doesn't really tell you much, but I could post it
if you like..)

Tim