Korg Poly800/EX800 Users

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@...m
> 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.
> > > 
> > >
> >
>