Ok, great. Still good news. I will do the tests I described earlier and
report back.

Thanks again!
Scott



-----Original Message-----
From: Doepfer_a100@yahoogroups.com [mailto: Doepfer_a100@yahoogroups.com ]
Sent: Tuesday, November 7, 2017 11:29 AM
To: Doepfer_a100@yahoogroups.com
Subject: AW: 1 Envelope Generator Problem

I also tried a simple patch (all modules in the same case/same supply):

permanent high gate / LFO rectangle -> A-140 gate in
A-140 out -> A-132-3 CV in
A-110-1 sawtooth out -> A-132-3 audio in
A-132-3 out -> scope

There is no diference in the loudness peak between the permanent gate and
the LFO triggered version of the A-140. I have no idea what happened in your
environment. I'd recommend to start with a similar simple patch
(VCO/VCA/ADSR) with all modules in the same case (same supply/GND).

Best wishes
Dieter Doepfer

> -----Ursprüngliche Nachricht-----
> Von: Doepfer_a100@yahoogroups.com
> [mailto: Doepfer_a100@yahoogroups.com ]
> Gesendet: Dienstag, 7. November 2017 16:59
> An: Doepfer_a100@yahoogroups.com
> Betreff: RE: 1 Envelope Generator Problem
>
>
>
>
>
> Yes, that is possible but I also used the analog meter. And since the
> problem is obvious in the waveform of the recorded audio, and to my
> ears, it’s obvious that the problem is definitely occurring. The
> voltages may not be exactly correct on the meter but that doesn’t
> change the fact that the first note is always much quieter. But I may
> try with the oscilloscope as well.
>
> I don’t remember this happening when I first got the Basis system
> 2 but maybe I was just too excited to notice it!
>
> I have 2 plans right now. One is to empty a case and only add the midi
> module and one ADSR. I can also do a test with ONLY the ADSR and use a
> gate from the SH-2 or Microbrute.
>
> The second is a bit easier and hopefully NOT the problem: All of my
> gear comes from a single UPS. It seems unlikely the UPS is the problem
> but I will try plugging these cases into a different outlet and see if
> that changes anything. I will also not use any power bars for the
> test. There a few other synthesizers plugged into the same power bar
> and they work fine so I don’t think this is the problem but you never
> know.
>
> I had a Creamware Pro12 stop working once because it was plugged into
> a cheap UPS. That one is entirely digital so it was a very different
> story, but it’s always worth testing everything!
>
> Thanks again Dieter
>
> Scott
>
>
>
> From: Doepfer_a100@yahoogroups.com
> [mailto: Doepfer_a100@yahoogroups.com ]
> Sent: Tuesday, November 7, 2017 10:48 AM
> To: Doepfer_a100@yahoogroups.com
> Subject: AW: 1 Envelope Generator Problem
>
>
> I took a look at your video: you cannot measure the peak voltage of an
> ADSR with a digital multimeter ! For this e.g. an oscilloscope is
> required. With the digital multimeter an average value over a period
> of time is measured (depending upon the measurement cycle of the meter
> in question).
>
> Best wishes
> Dieter Doepfer
>
> > -----Ursprüngliche Nachricht-----
> > Von: Doepfer_a100@yahoogroups.com
> > [mailto: Doepfer_a100@yahoogroups.com ]
> > Gesendet: Dienstag, 7. November 2017 16:34
> > An: Doepfer_a100@yahoogroups.com
> > Betreff: RE: 1 Envelope Generator Problem
> >
> >
> > Thanks for doing this. That's good news... in a way. Now the
> question is,
> > why is this happening
> >
> > I think I will have to empty one of the cases and build a very
> > simple synthesizer with minimal parts and see what happens.
> >
> > Thanks again!
> > Scott
> >
> >
> >
> > -----Original Message-----
> > From: Doepfer_a100@yahoogroups.com
> > [mailto: Doepfer_a100@yahoogroups.com ]
> > Sent: Tuesday, November 7, 2017 10:26 AM
> > To: Doepfer_a100@yahoogroups.com
> > Subject: AW: 1 Envelope Generator Problem
> >
> > Hello,
> >
> > I took an A-140 and cannot confirm this behaviour. That's what I did:
> >
> > - wait about 10 seconds
> > - permanent high signal to the gate input
> > - measuring the ADSR output (especially the peak voltage) with
> > oscilloscope
> > -> peak is about +8.4V
> > - replacing the permanent gate signal by an LFO rectangle with
> about 10 Hz
> > - measuring the ADSR output (especially the peak voltages) with
> > oscilloscope
> > -> all peaks are about +8.4V
> >
> > I could detect any difference in the peak level of the "first"
> > envelope (permanent gate) and the peak levels when the A-140 was
> > triggered by the LFO.
> >
> > Best wishes
> > Dieter Doepfer
> >
> >
> >
> > > -----Ursprüngliche Nachricht-----
> > > Von: Doepfer_a100@yahoogroups.com
> > > [mailto: Doepfer_a100@yahoogroups.com ]
> > > Gesendet: Dienstag, 7. November 2017 04:11
> > > An: Doepfer_a100@yahoogroups.com
> > > Betreff: 1 Envelope Generator Problem
> > >
> > >
> > >
> > >
> > >
> > > Hi Folks
> > >
> > > Sorry to post this again but my whole modular synth is unusable
> > > until I fix this problem so I still need help.
> > >
> > > The problem: All of my envelope generators do the same thing -
> > > When I play a note they peak at a certain voltage, lets say 5
> > > volts. But when I play a second note that peak rises to 6 volts.
> > > And in some cases when I play 16th notes it rises even more.
> > >
> > > So when I connect the output of an envelope generator to a VCA the
> > > first note I play is always MUCH quieter than every following note.
> > >
> > > I have 3 Doepfer LC9 cases with various modules in each. This
> > > behavior is consistent in all three boxes with all of my envelope

generators.

> > >
> > > The modules are:
> > > Doepfer A-140 (3 of these)
> > > Doepfer A-143-2 quad
> > > Roland 540
> > >
> > > Also, the all 4 of the envelopes in the A-143-2 do not actually
> > > sustain. The voltage constantly falls when a note is held, even
> > > when the sustain level is set to maximum. That is a separate
> > > problem but I thought I'd mention it.
> > >
> > > Also, for some reason the release time of the Roland 540 is only
> > > 2 seconds (even on the Slow setting) when plugged into any VCA,
> > > however when it is plugged into the Roland filter the release time
> > > is much longer. Another weird problem but I thought I'd mention it
> > > in case it was an important clue.
> > >
> > > I have tested the output of all of the envelopes with both analog
> > > and digital volt meters to confirm the behavior.
> > >
> > > At this point I'm not sure what to do to fix this. I guess the
> > > first question is: Is this the way these envelopes are supposed to
> > > work I have owned analog synthesizers since 1978 and own a lot of
> > > them right now and not a single one has this behavior.
> > > Other than when using velocity sensitivity, every note played is
> > > exactly the same volume.
> > >
> > > Is this a known issue Are there combination of modules that can
> > > cause this to happen Could it be the power supplies I have moved
> > > the modules around and found the behavior is the same regardless
> > > of how many modules (or which ones) are in a case.
> > >
> > > What kind of troubleshooting can I do With only a trigger voltage
> > > being sent to the Envelope module I don't think there could be
> > > anything else interfering but I'm looking for any clues at all,
> > > even the most obvious ones that I may have overlooked.
> > >
> > > I did a video to show the problem: https://youtu.be/x8_1ZnmPWLo
> > >
> > > Thanks for any ideas anyone might have!
> > >
> > > Scott
> > >
> > >
> > >
> > >
> > >
> > >
> >
> >
> >
> > ------------------------------------
> >
> > ------------------------------------
> >
> >
> > ------------------------------------
> >
> > Yahoo Groups Links
> >
> >
> >
> >
> >
> >
> > ------------------------------------
> > Posted by: "Scott Rogers" < scott@... >
> > ------------------------------------
> >
> >
> > ------------------------------------
> >
> > Yahoo Groups Links
> >
> >
> >
>
>
>
>

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