Doepfer

Hi Danko/Florian/anybody else still listening...

> > Ooops! Had more of think about this, and realised I was confusing 
> the 
> > 148 with the freeze/follow of the 129/5...
> 
> No, no, no, bad boy! 129/_3_ of course... (oh dear, one of those 
> days). So maybe there is a solution with a 129/4 and 129/3? I'll 
> experiment and see how 'laggy' the signal is out of the 129/3.

Sorry, but this is turning into a bit of a monologue..., but here are 
some more ramblings and 'results' of my experimentation:

Using an A-179 light controlled voltage source in lieu of the 198, 
since this also gives a variable CV and gate signal. I took the CV 
through a 138 and added a constant voltage of a few volts, so that 
when 'gated' the CV varied about some greater-than-zero point. This 
then went through an A-150 which was controlled by the gate, so that 
the 150 output was then a CV which dropped immediately to zero when 
the gate was closed. I don't have a 165 trigger inverter, so I 
subtracted 5V from the gate (129/3 -> 175 -> 138) and inverted that 
through the second half of the 175. I checked that the rising edge on 
this _was_ sufficient to trigger the 148 S&H. So, output of first 150 
goes to input of second half of 150 and input of S&H (triggered by 
inverted gate), then to second input of 150: second VC switch also 
controlled by the original gate signal. Then from second 150 to A-110 
whose output went through VCA (131) controlled by 140 (also gated by 
original gate). Much to my astonishment the S&H *is* able to capture 
the voltage coming out of the first half of the 150 *before* it has 
fallen down to zero: hence I could dial in some release on the 140 to 
lose the 'tock' made as the VCA shuts off violently without it, and 
you don't hear the pitch dropping all the way to zero.

This is so far removed from a 198 being fed into a 148 (gated by a 
165 inverted gate) and thence into a 150 before onto the 110 that I 
still wouldn't bet on *that* combination working in the same way!

I also tried replacing the 148 and second 150 switch by just using 
the 129/3. It's quite clear that the 129/3 does add a little slew 
onto the CV (even when set to 'follow': it is basically a low pass 
filter), but it does nicely capture the CV before it drops to zero 
again if 'frozen' by the gate (into the freeze input of a 129/4, 
feeding the slew in on the 129/3). (It was also possible to take the 
129/4 out of the equation completely by feeding the offset gate 
signal direct into the 129/3 slew input to freeze it that way.) 
However when it comes out of 'freeze', because of the inherent slew 
action in the 129/3, it was sometimes possible to hear the signal 
slewing in order to catch up to where it now was.

My conclusion is: I can't really recommend a way to do it, but I 
think it probably is possible given enough modules (and patience, and 
experimentation)! (It certainly gets you thinking, even if I wasn't 
initially.)

Cheers,

Tim