what kind of frequencies are involved at these points?
and what are the steps/components that divide down the clock?
saw also that there are outputs for two other 'fundamentals'(?)
at 8' and 16', described as 'rectangle'(is this the same as pulse?)
on a different note, looking at the block diagram, showing
the separate outputs of each tone source, it would seem to
offer the opportunity for cross modulation, such as ringmod,
and some type of FM. (obviously, independent detune comes in
here...). you can get a good range of tx-type sounds with
just two operators/oscillators using audio from one to mod
∗phase∗ on the other, sync/un-sync, with relative detuning.
there could maybe be some kind of variable sync'ing of oscillators?
or are they already sync'd by being run by shared clock?
it's quite a leap; doesn't hurt to talk about it, tho'.
--- In korgpolyex@yahoogroups.com, Michael Hawkins <korgpolyex800@...> wrote:
>
> Detune is based upon IC20 (74HC393), IC19 (74HC151) and logic parts of IC17 and
> IC18.
>
> It is marked on the schematic as section "22" and in the service manual it is
> explained there.
>
> The Poly-800 has one master oscillator. Pitch bend and DCO modulation signals
> are injected into the master oscillator.
>
> The master clock is fed directly into CLK1 on the DCO tone generator (marked on
> the schematic as "K".
>
> The detuned clock takes the master clock as its input source, detunes it and
> then feeds it into CLK2 on the DCO tone generator. Marked as "J".
>
> Mike
>
>
>
>
> ________________________________
> From: microbugix <springmauser@...>
> To: korgpolyex@yahoogroups.com
> Sent: Sat, February 19, 2011 6:21:46 PM
> Subject: [korgpolyex] Re: the synth architecture
>
>
> Michael,
>
> can you give me a hint which components belong to the detune circuit? Is ot
> IC17/18? I take a look at the schematics but on my 19" monitor I still have no
> overwiew, think I should get it printed:)
>
> Im remember well the unison detune circuit of my Polysix, it was simple, but
> clever: an additional 4051 just added switched positive or negative offsets to
> the osciallator CVs. On the 800 it is a digital circuit I think.
>
> --- In korgpolyex@yahoogroups.com, Michael Hawkins <korgpolyex800@> wrote:
> >
> > the detune circuit is just begging for some one to come along and design a much
> >
> > more fine tuned detuned.
> >
> > But, keep in mind that the MSM5232 chip uses two clocks which then feeds into
> > the two banks of 4 DCO's.
> >
> > So if someone comes up with a great detune circuit, it is still only going to
> > affect DCO1 to DCO2 detuning. And it won't detune all DCO's.
> >
> > The four DCO's will still be in pure tune and then the other four DCO's will be
> >
> > in perfect tune. The two clocks detuned would at least detune the two pairs of
>
> > DCO's. So that would be great.
> >
> > Mike.
> >
> >
> >
> >
> > ________________________________
> > From: k9k9dog <domgoold@>
> > To: korgpolyex@yahoogroups.com
> > Sent: Tue, February 15, 2011 2:57:30 PM
> > Subject: [korgpolyex] Re: the synth architecture
> >
> >
> > ok; so single (D)CF, post VCAs. eg, mix pre-filter.then, i guess,
> > another vca to set output level?
> >
> > in synthedit, it made sense to share a filter to save cpu on a
> > recent project, but that was pre vca/pan and mix/level.
> >
> > interested you say there 8 oscillators, whereas i was suspecting
> > a single osc, with freq/dividing to produce divisions/harmonics.
> >
> > so this could suggest independent outputs and operation? detuning?
> > i find the detuning a bit unimpressive, tbh, just semi's, whereas
> > somethign finer could really fatten things up a bit. and phasemod
> > and stuff like that...
> > hey, i haven't seen/used my ex800 (poly1) for some time, so i forget
> > a bit. wdf, it has it's own character, within what it has.
> >
> > i'll look for the stuff you mention, but would like something
> > 'from the horse's mouth', eg this group of interested users,
> > from the circuit-bending viewpoint, for purpose of discussion.
> > (i ain't going in there messing things up)
> >
> > my main reference atm is synthedit, which has allowed me to
> > experiment with things like phase etc. just means i can plug
> > things in without breaking anything...
> >
> > --- In korgpolyex@yahoogroups.com, Paul Cunningham <paul@> wrote:
> > >
> > > the main difference with the Poly-800 series as opposed to other polysynths
> >of
> >
> > >the era is that all eight oscillators are first routed through their own
> > >amplifier, and then through a ∗shared∗ 4-pole filter. this makes it a unique
> > >instrument to play harmonically -- something between a polysynth and a
> > >monosynth. all of the other synths you mentioned use the more traditional
> > >polysynth architecture which provides each voice it's own filter and
> >amplifier,
> >
> > >with the filter before the amplifier. -pc
> > >
> > >
> > > On Feb 14, 2011, at 3:44 PM, k9k9dog wrote:
> > >
> > > > wondering what a block diagram of this synth
> > > > would look like. as in, a kind of signal flow
> > > > diagram or something like that.
> > > >
> > > > just wondering about theoretical possibilities
> > > > (and impossibilities) for future ideas;
> > > > for instance, taking separate harmonics and
> > > > rerouting them, ringmod options, stuff like that?
> > > >
> > > > i'd like to know more about what's going on inside,
> > > > how it compares,say, to juno's jp's and jx's. some
> > > > kind of assessment/description of the osc+filter etc.
> > > > circuitry.
> > > >
> > > >
> > >
> >
>