Doepfer

Tim,

Go get yourself a pint.

Kevin



--- In Doepfer_a100@yahoogroups.com, "Tim Stinchcombe" <timothy@t...> 
wrote:
> 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