well, i guess you have to introduce also the remaining part of a typical synth voice: VCF, VCA and ADSR.

In fact, the VCO, even after note release command, still keep on producing its wave according to the pitch set by knobs. if you want to have the typical behavior of a synth, you need to take the gate out from you midi/cv module, connect to gate in in your adsr, connect adrs out to VCF/VCA (at least VCA assuming VCF is opne), set VCA gain to 0 and VCA CV knobs to a positive degree.

in this way, when you press a note, not only 1V/oct voltage is sent to VCO, but gate signal is sent to ADSR, this trigger ADSR that in turn will open the VCA making you listen to sound. as you keep the key pressed the envelope will go through ADS, as soon you stop pressing the key, the envelope enters the Release phase that will close the VCA.
at this point you won't hear any sounds until you press again a new key.

--- In Doepfer_a100@yahoogroups.com , Karl Anderson <karlanderson7@...> wrote:
>
> Hi Doepfer_a100 group,
>
> I'm brand new to the A-100 system (and modulars in general), and this is my
> first post to this group, so please forgive me for asking about something
> that should probably be common knowledge.
>
> Anyway, I recently purchased a secondhand A-100 system. I believe it is the
> Basic System 2, although the modules might be arranged in a different
> configuration than the standard factory configuration. I would be happy to
> list all of the modules in the top and bottom rows if it is pertinent to
> this issue.
>
> As far as I can tell, everything seems to be working with the synth. I'm
> looking forward to experimenting with all sorts of different kinds of
> patches, but I figured I'd start out with the basic patch for the mini
> system, the first example on this page:
> http://www.doepfer.de/a100_man/a100_patch.htm. I made all of the necessary
> connections, and then connected CV1 out from the A-190 midi/CV sync
> interface to the CV1 input of the first VCO. This creates the basic synth
> sound when I play my midi keyboard controller. It sounds good, but there is
> one problem. This primary synth voice behaves as it should, and responds to
> the note on/off signals that happen when I press and release keys, but
> there seems to be another sustained voice that does not respond to the
> note-off signals. I can tell that this "other" voice is also coming out of
> VCO 1 because it changes pitch as I adjust the range and tune knobs of that
> oscillator. I would like to make it so all sounds are silenced when I
> release a key (at least for this initial patch).
>
> Do you have any thought about why this isn't happening I've been trying to
> study the A-190 manual to see if that would help, but for that module's
> manual there are no diagrams for how to make basic connections. Do I need
> to connect the "Gate" output to something to get this "secondary" pitch to
> stop If so, what None of the other ports I've tried seem to take care of
> this. Or do I need to make some kind of setting with the button-controlled
> "menu" on the A-190 Or is there some other patching connection that would
> resolve this issue
>
> Thank you very much for any help or ideas!
> -Karl
>
>
> [Non-text portions of this message have been removed]
>