Korg Poly800/EX800 Users

thanks for the info on the other VR pots, I guess I shouldn't mess 
with them or i will kill my korg... I assume this means that I could 
only really add a white noise pot (which I really am not too 
interested in). 

I'm just wondering if there are any other tweaks I could make the it 
that aren't too-difficult for someone who's a little shaky with the 
soldering iron... I was particularly hoping to be able to adjust the 
filter rate and EG intervals with analog controls, is that at all 
possible or am I having a pipe dream? 

~AJB
PS - Even if that is a no-go, does anyone know of any other not-too-
strenuous mods that can be applied to the poly800?



--- In korgpolyex@yahoogroups.com, Dan Brewton <dannobe123@y...> 
wrote:
> AJB
>  
> Yes, its true there is only very Limited variables that we can 
tweak, in these
> machines...... especially since the majority of features are 
implemented
> in FIRM_ware..... i.e. Read-Only ROM. The Computer within does a 
remarkable
> job of digitally synthesizing these effects .... we have only the 
Play parameters
> to change, by design. The POTs, or variable resistors on the 
Mother_Board,
> should not be messed with, other than the two you have 
already,,...and that
> can result in rather extreme results ! 
> VR1 is to adjust the 5 Volt Regulator,
> so that is a definite No-no ( unless to minor adj. 5v to 5.000V)
> VR3 sets the Max-Noise level , as Function 33 's ceiling value
> VR4 is the Digital-to-Analog Offset adjustment and by no means 
should change
> from its optimum setting , as VR1.
>  
> The two pots you have played with can have some refinements as 
yet...
> VR2 is VCF_Cutoff frequency adjustment.....the factory adjustment 
procedure
> just has you tweak until a certain amplitude is maximized.... +/- 
that peak 
> means you can only reduce the degree of the effect off optimum.
> VR5 is limiting the maximum amplitude so as to not overdrive the 
NJM2069 VCF
> chip into oscillation, but then that effect is desirable if not at 
its extreme value.
>  
> Anyway, refer to two experts in the archives : "plutoniq9" and 
marjan urekar
> Cheers
> Dan