Great to hear from you again Atom,
The TG in the Poly 800 is the OKI MSM-5232. This chip was actually
used in many arcade games and that seems to be what it was designed
for. Regardless, the design has two master clock inputs. One clock
drives DCO1-4 and the other drives DCO5-8. In the Poly 800, chips
IC-18,19 and 20 provide the detune clock which uses the master clock
as input and detunes prior to feeding it to the second clock input on
the MSM-5232. The registers in the MSM-5232 itself only allow for the
selection of real notes, there is ability to detune the DCO's within
the MSM-5232 itself. That is why Korg moved to an sampled wavetable
design in the EX-8000.
So the only way to provide 8 fully detuned DCO's would be a large
hardware change (something I am considering for the future).
But you said "some way to route velocity to the filter cutoff and/or
resonance...".
I think that feature is very doable. In fact, it may be easier to
route velocity to the filter than changing the VCA EG's to track
velocity. So I have definitely noted that feature down for
implementation as soon as possible.
Thanks for thinking of it.
Mike.
--- In korgpolyex@yahoogroups.com, Atom Smasher <atom@...> wrote:
>
> On Tue, 10 Jul 2007, korgpolyex800 wrote:
>
> > In the Poly 800 they used a tone generator chip that had 8 DCO's
grouped
> > as a pair of four with a separate clock for each pair. This naturally
> > allowed a master oscillator to drive the clock input along with a
simple
> > detune circuit that would be used to make the second set of four
DCO's
> > detune away from the first four DCO's.
> ======================
>
> wouldn't it be possible/feasible to get a four (or eight) oscillator
> detune in a similar way to playing a chord: just tell each of the
four (or
> eight) oscillators to play a slightly different note...? instead of the
> different notes being semitone intervals apart, they can be small
> fractions of a semitone apart, ideally with a parameter to adjust the
> detune.
>
> i suppose that sound could also be done by inserting a chorus effect
> between the oscillators and the filter, but then we're in the realm
of a
> hardware mod.
>
> i'm just trying to imagine a poly-800 in mono/portamento mode, with my
> hardware mods, and some way to route velocity to the filter cutoff
and/or
> resonance...
>
>
> --
> ...atom
>
> ________________________
> http://atom.smasher.org/
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>
> "I never gave them hell, I just tell the truth
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> -- President Harry Truman, 1956
>