> At any rate I'm interested in phase quadrature, and the status of
> the module.
>
> One thing was not clear to me when reading introductory
> literature to the module: does it also return the cosine of (any)
> input signal

To speak the truth I don't understand what you mean with "return the cosine
of any input signal". The planned Tru-Z quadrature VCO is an oscillator. It
does not output the cosine of an input signal but generates a sine and
cosine signal simultaneously and the frequency of the sine/cosine is voltage
controlled.

Best wishes
Dieter Doepfer