Discussion about the Korg PolySix synthesizer

Hello everybody,

I recently got my SSM 2044 chips and installed them into my Trident MK2.
I managed to tune the VCF resonance using VRx01 - 03 on board KLM-378B.

My problem is that the tuning only stays consistent for the middle
octave, lower notes and especially higher ones are detuned.

This might be a problem with the adjustment of keyboard tracking. Does
anybody know how to adjust that?

Thanks for your time.

   Niels

i don't know about the trident but on polysix you have 2 pots for
filter tuning (you're actutally tuning cutoff, not resonance):
one for VCF offset
one for VCF scale

however, expect that the tracking will be way worse than VCO's
tracking. maybe 3 usable octaves.

jure

On 4/20/06, Niels Ott <niels.ott@web.de> wrote:
> Hello everybody,
>
> I recently got my SSM 2044 chips and installed them into my Trident MK2.
> I managed to tune the VCF resonance using VRx01 - 03 on board KLM-378B.
>
> My problem is that the tuning only stays consistent for the middle
> octave, lower notes and especially higher ones are detuned.
>
> This might be a problem with the adjustment of keyboard tracking. Does
> anybody know how to adjust that?
>
> Thanks for your time.
>
>    Niels
>
>
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
> Yahoo! Groups Links
>
>
>
>
>
>
>

jure zitnik wrote:
> i don't know about the trident but on polysix you have 2 pots for
> filter tuning (you're actutally tuning cutoff, not resonance):

Yes, true, as the SSM2044 will produce a sine wave at its cutoff frequency.

> one for VCF offset
> one for VCF scale


I can't match those names with any hearing expierence from my tuning.  ;-)

There are three pots on the Trident Mk2, one seems to control cuttoff
freq (is this what you call scale?) and the other one amount of
resounance. The third one I don't know...

> however, expect that the tracking will be way worse than VCO's
> tracking. maybe 3 usable octaves.

Hm the VCO tuning works great. I tuned it according to the document from
the files section of this Yahoo group and it's reasonably stable.

(I'm using a simple KORG guitar tuner for all of this.)

But back on topic: It seems to me that there should be a general "tuning
knob" for the VCF. The voices are alright now, they sound all the same
and (in my ears) as they should.

It's just that the high and low octaves of VCF resonance don't really
match the tuning. (The VCO is alright.)

Isn't there a similar tuning mechanism as for the VCO?

I'm not so keen on guessing by twiddling with trimpots. I don't like to
mess things up.

   NIels

well on polysix there are 3 trimpots on the top of each voice chain. i
think the first is cutoff CV offset and the second is scale. i'm not
100%.

i could be wrong though and maybe there's just one trimpot - just for CV offset.

jure

On 4/20/06, Niels Ott <niels.ott@web.de> wrote:
> jure zitnik wrote:
> > i don't know about the trident but on polysix you have 2 pots for
> > filter tuning (you're actutally tuning cutoff, not resonance):
>
> Yes, true, as the SSM2044 will produce a sine wave at its cutoff frequency.
>
> > one for VCF offset
> > one for VCF scale
>
>
> I can't match those names with any hearing expierence from my tuning.  ;-)
>
> There are three pots on the Trident Mk2, one seems to control cuttoff
> freq (is this what you call scale?) and the other one amount of
> resounance. The third one I don't know...
>
> > however, expect that the tracking will be way worse than VCO's
> > tracking. maybe 3 usable octaves.
>
> Hm the VCO tuning works great. I tuned it according to the document from
> the files section of this Yahoo group and it's reasonably stable.
>
> (I'm using a simple KORG guitar tuner for all of this.)
>
> But back on topic: It seems to me that there should be a general "tuning
> knob" for the VCF. The voices are alright now, they sound all the same
> and (in my ears) as they should.
>
> It's just that the high and low octaves of VCF resonance don't really
> match the tuning. (The VCO is alright.)
>
> Isn't there a similar tuning mechanism as for the VCO?
>
> I'm not so keen on guessing by twiddling with trimpots. I don't like to
> mess things up.
>
>    NIels
>
>
> PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
> Yahoo! Groups Links
>
>
>
>
>
>
>

I used made both Trident and P6 retrofits and they both work very 
well.

--- In PolySix@yahoogroups.com, "jure zitnik" <kokoon@...> wrote:
>
> i don't know about the trident but on polysix you have 2 pots for
> filter tuning (you're actutally tuning cutoff, not resonance):
> one for VCF offset
> one for VCF scale
> 
> however, expect that the tracking will be way worse than VCO's
> tracking. maybe 3 usable octaves.
> 
> jure
> 
> On 4/20/06, Niels Ott <niels.ott@...> wrote:
> > Hello everybody,
> >
> > I recently got my SSM 2044 chips and installed them into my 
Trident MK2.
> > I managed to tune the VCF resonance using VRx01 - 03 on board KLM-
378B.
> >
> > My problem is that the tuning only stays consistent for the middle
> > octave, lower notes and especially higher ones are detuned.
> >
> > This might be a problem with the adjustment of keyboard tracking. 
Does

> > anybody know how to adjust that?
> >
> > Thanks for your time.
> >
> >    Niels
> >
> >
> > PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
>

the pots are for res, res Freq and offset 

--- In PolySix@yahoogroups.com, "jure zitnik" <kokoon@...> wrote:
>
> well on polysix there are 3 trimpots on the top of each voice 
chain. i
> think the first is cutoff CV offset and the second is scale. i'm not
> 100%.
> 
> i could be wrong though and maybe there's just one trimpot - just 
for CV offset.
> 
> jure
> 
> On 4/20/06, Niels Ott <niels.ott@...> wrote:
> > jure zitnik wrote:
> > > i don't know about the trident but on polysix you have 2 pots 
for
> > > filter tuning (you're actutally tuning cutoff, not resonance):
> >
> > Yes, true, as the SSM2044 will produce a sine wave at its cutoff 
frequency.
> >
> > > one for VCF offset
> > > one for VCF scale
> >
> >
> > I can't match those names with any hearing expierence from my 
tuning.  ;-)
> >
> > There are three pots on the Trident Mk2, one seems to control 
cuttoff
> > freq (is this what you call scale?) and the other one amount of
> > resounance. The third one I don't know...
> >
> > > however, expect that the tracking will be way worse than VCO's
> > > tracking. maybe 3 usable octaves.
> >
> > Hm the VCO tuning works great. I tuned it according to the 
document from
> > the files section of this Yahoo group and it's reasonably stable.
> >
> > (I'm using a simple KORG guitar tuner for all of this.)
> >
> > But back on topic: It seems to me that there should be a 
general "tuning
> > knob" for the VCF. The voices are alright now, they sound all the 
same
> > and (in my ears) as they should.
> >
> > It's just that the high and low octaves of VCF resonance don't 
really
> > match the tuning. (The VCO is alright.)
> >
> > Isn't there a similar tuning mechanism as for the VCO?
> >
> > I'm not so keen on guessing by twiddling with trimpots. I don't 
like to

> > mess things up.
> >
> >    NIels
> >
> >
> > PolySix "Digiest" Page: http://www.acc.umu.se/~amber/Poly6
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
>