Hi Pierre

If you sent an audio rate

> signal, it would take eight cycles of that signal to replay the whole
> 'waveshape' drawn by the knobs. So there'd always be an eightfold frequency
> discrepancy between the incoming and outgoing signals. Correct Or am I
> completely off the mark here

You are right. Usually you need a PLL to multiply the input frequency.
Alternatively you could adjust (internally) one VCO module to run that high.

I have to admit, that I found the possibilities of graphic VCOs not that
thrilling, as I expected. If you change the waveform while a note or
melody most times 98% of the effect could be achieved by PWM or simple
filtering.
If you want a module which does really astonishing waveform changes,
than checkout the A-137. This is one of the brightest gems within the
A-100 moduls.

> I see that it is possible to use it as a multi-stage envelope via the a154,
> but is it possible to do this without an a154 using other modules

If you connect the last trigger to the stop input and the "stop = reset"
function is enabled (internal jumper), it should be possible without
the A-154.

Florian