Discussion about the Korg PolySix synthesizer

im still fooling with my '367-fixed' polysix and it seems that when i 
play multiple notes simultaneously, the background hiss/white noise 
increases as if it is amplified with each sucessive added voice as 
notes are added to a chord  . some sounds hide it, but its noticeable 
on many patches.  I know i have this noisy pulsing VCA on the MG 
section that i posted about before, and was told to check out around IC 
20/21 on the 387.  While this other white noise doesnt pulse , it is 
similar in tonal quality . The results of this is that the polysix just 
sounds 'dirty', and seems not right. could they be related?

Hi,

This sounds like another job that might require access to an 
oscilloscope! What might be an idea is to generate a single known 
waveform (i.e. a saw at A440) on one voice and then, starting at the 
output (the hot end of VR1 on the KLM369) work back through the 
signal path until you reach the voice mixer (which is the output from 
op-amp IC10) So:

KLM369 CN15/3 -> KLM368 CN14/1, KLM366 CN14/1

Then compare the waveforms at each waypoint. My feeling here is that 
you might find the signal is getting affected by the circuitry on the 
effects boards. Yes, of course, but not in a way we want. Does the 
nature of the sound change as you operate the effect type and 
intensity at all?

Cheers,
Andy

--- In PolySix@yahoogroups.com, "wasteking1" <wasteking1@...> wrote:
>
> im still fooling with my '367-fixed' polysix and it seems that when 
i 
> play multiple notes simultaneously, the background hiss/white noise 
> increases as if it is amplified with each sucessive added voice as 
> notes are added to a chord  . some sounds hide it, but its 
noticeable 
> on many patches.  I know i have this noisy pulsing VCA on the MG 
> section that i posted about before, and was told to check out 
around IC 
> 20/21 on the 387.  While this other white noise doesnt pulse , it 
is 
> similar in tonal quality . The results of this is that the polysix 
just 
> sounds 'dirty', and seems not right. could they be related?
>

--- In PolySix@yahoogroups.com, "Andrew Jury" <andy@...> wrote:
>
> Hi,
> 
> This sounds like another job that might require access to an 
> oscilloscope! What might be an idea is to generate a single known 
> waveform (i.e. a saw at A440) on one voice and then, starting at 
the 
> output (the hot end of VR1 on the KLM369) work back through the 
> signal path until you reach the voice mixer (which is the output 
from 
> op-amp IC10) So:
> 
> KLM369 CN15/3 -> KLM368 CN14/1, KLM366 CN14/1
> 
> Then compare the waveforms at each waypoint. My feeling here is 
that 
> you might find the signal is getting affected by the circuitry on 
the 
> effects boards. Yes, of course, but not in a way we want. Does the 
> nature of the sound change as you operate the effect type and 
> intensity at all?
> 
> Cheers,
> Andy
> 
> --- In PolySix@yahoogroups.com, "wasteking1" <wasteking1@> wrote:
> >
> > im still fooling with my '367-fixed' polysix and it seems that 
when 
> i 
> > play multiple notes simultaneously, the background hiss/white 
noise 
> > increases as if it is amplified with each sucessive added voice 
as 
> > notes are added to a chord  . some sounds hide it, but its 
> noticeable 
> > on many patches.  I know i have this noisy pulsing VCA on the MG 
> > section that i posted about before, and was told to check out 
> around IC 
> > 20/21 on the 387.  While this other white noise doesnt pulse , it 
> is 
> > similar in tonal quality . The results of this is that the 
polysix 
> just 
> > sounds 'dirty', and seems not right. could they be related?
> >
>

It seems that the nature of the  "additive' white noise generaly 
stays the same, but on some patches it seems that it is a bit 
diffrentin pitch  when i play  bass notes rather than   high pitched 
ones.And  still, some patches seem fine.  When i hear the noise i can 
increase its intensity with the attenuator.  If the sound has the MG 
set on VCA (or i switch it to VCA) i then get  the white noise 
pulsing in the background , even when NO notes are played. (that is 
the most annoying, because there should be silence. ) this is subtle, 
but clearly there and not subtle when it pulses. The MG frequency and 
level controls DO affect the pulsing white noise.