Doepfer

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