Sorry about the weird link...it seems that the URL is one character too long for the line-wrapping here. Wacky.
Anyway, I've spent a little time exploring the MG circuit and how the MG Delay interacts with it. It appears that, on my Polysix at least, the MG Delay Control Voltage (CV) coming out of the DAC is slightly too high, which thereby allows the keypress to suppress the MG signal, even when the MG Delay is zero. Bummer.
If you're interested, you can check out details of my measurements at:
http://synthhacker.blogspot.com/2013/08/polysix-exploring-mg-delay-circuit.htmlTo fix this problem, I can't really address the output of the DAC (beyhond recalibration, which I've done). So, as mentioned in the post, I'm going to alter the circuit to affect the voltage that is compared to the MG Delay CV. If I can raise up that voltage slightly, I'll achieve my goal of avoiding MG suppression when the MG Delay is zero.
Chip
--- In PolySix@yahoogroups.com, "synth_o_sphere" <stannloo@...> wrote:
>
> Well, link still not working, but I managed to fix it manually.
>
> Folks: just add and "l" (letter 'elle', not number one) after ".htm"
>
> Will try to reproduce it this weekend Chip, when I have a minute.
> And will let you know.
>
> Also, if you really want to make things really clear, you could record the same bit but on your Mono/Poly and let us hear what you are expecting to have, exactly. Just an idea...
>
> -Chris/Synthosphere
>
>
> --- In PolySix@yahoogroups.com, "chipaudette" <chipaudette@> wrote:
> >
> > Hmm...let's try that link again:
> >
> > http://synthhacker.blogspot.com/2013/08/polysix-mg-delay-of-zero-is-not-zero.html
> >
> > Chip
> >
> > --- In PolySix@yahoogroups.com, "chipaudette" <chipaudette@> wrote:
> > >
> > > I put up an audio sample and a visual illustration of this unexpected behavior:
> > >
> > > http://synthhacker.blogspot.com/2013/08/polysix-mg-delay-of-zero-is-not-zero.html
> > >
> > > Chip
> > >
> > > --- In PolySix@yahoogroups.com, "synth_o_sphere" <stannloo@> wrote:
> > > >
> > > > Hey Chip,
> > > >
> > > > I was not able to reproduce what you describe.
> > > > When I play new notes, they come in at the filter value prescribed by the MG, wherever this one is in its sweeping wave.
> > > >
> > > > I don't hear this "coming from the VCF value" sweeping you mention.
> > > >
> > > > Now, maybe I haven't reproduced your conditions exactly...
> > > > That's possible.
> > > > But I tried many different things to try and reproduce what you say and couldn't. Sorry.
> > > >
> > > > Maybe you could upload a demo of if on your cloudfront page or a video on your blog?
> > > >
> > > >
> > > > -Chris, from Synthosphere.
> > > >
> > > >
> > > > --- In PolySix@yahoogroups.com, "chipaudette" <chipaudette@> wrote:
> > > > >
> > > > > Hi All,
> > > > >
> > > > > I have a question regarding the MG Delay knob and whether your Polysix responds the same way...
> > > > >
> > > > > I set up a patch using a basic saw wave and with the filter cutoff set to half-way. The filter envelope is set to zero (neither positive nor negative. I then set the MG for a very slow sweep with zero delay and moderate intensity (say 3-5). I set the MG to effect the VCF.
> > > > >
> > > > > Now, when I manually play a series of individual notes, I would expect to hear the notes as effected by the slowly opening and closing filter (opening and closing due to the slowly sweeping MG). I would expect it to be smooth and nice.
> > > > >
> > > > > Instead, what I hear is that the beginning of each note is quickly swept from mid-filter (ie, the setting on the VCF cutoff knob) to whatever cutoff value is being set by the MG. So, you hear the filter either quickly open or quickly close, depending upon where you are in the MG cycle.
> > > > >
> > > > > If the MG Delay were set to anything but zero, this is exactly what I would expect. But, my MG Delay is set to zero, so I would not expect to hear any transition.
> > > > >
> > > > > Does your Polysix do this? I'd like to know whether I'm seeing a symptom of a broken component, or whether this is a design "feature" of the Polysix.
> > > > >
> > > > > Thanks,
> > > > >
> > > > > Chip
> > > > >
> > > >
> > >
> >
>