LZX Cadet X - DIY Video synthesizer - Multiplier

Some pics of the Cadet DIY modular video synth build.
I am an independent builder and have nothing to do with LZX industries.
These aren't official build notes, just my records to help me trouble shoot.
It's a work in progress.
Do let me know if you spot any errors or omissions.
This is module no.10 (Multiplier X).

It's described as "Cadet X Multiplier is a variation on the Cadet VI Fader circuit,
 configured as a switchable 2-quadrant or 4-quadrant multiplier".
So if I understand this correctly, in 2-quadrant mode it it acts like a VCA and in 4-quad mode it behaves like a ring-modulator..... "it crossfades between an inverted version of the input signal
and a positive version of an input signal"

2-quadrant mode = VCA.
You can control the amplitude with a control voltage (0 = no signal & 1V = max signal)

4-quad mode = Ring Modulator
The amplitude of the output is again controlled by CV.
When CV is negative ( -1V for LZX = max inversion) signal gets inverted.
When CV is positive  ( +1v on LZX = max amplification) signal is non-inverted.




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