Korg Mono/Poly

One more quick question.

I stumpled upon this on the interwebs:
"SPEEDING UP THE ENVELOPES:
it's been said that korg seemed to have used the wrong pots: they have linear potentiometers inside [the MP], if you replace them by exponential ones the ENVs will be much faster!" Sequencer.de

Have any of you tried this mod? Would it work?

Thanks
Jeppe

Hi Jeppe


> I stumpled upon this on the interwebs:
> "SPEEDING UP THE ENVELOPES:
> it's been said that korg seemed to have used the wrong pots: they have linear potentiometers inside [the MP], if you replace them by exponential ones the ENVs will be much faster!" Sequencer.de
> Have any of you tried this mod? Would it work?
There is not much truth in this sentence.
1.) The potetiometers for Attack, Decay, and Release *are* logarithmic 
(that is what the author wants to say with "exponential" - there are no 
exponential potentiometers, but logarithmic, linear, and 
antilogarithmic). You can findout what kind of potentiometer is used, by 
reading the letter A, B or C after the resistance value. The japanese 
naming for potentiometers is an A for logarithmic (A as "Audio"), an B 
for linear, an C (for "reverse"). So "100kA" stands for a 100 kiloohm 
(the k) potentiometer with logarithmic (the A) taper. 2MB stands for 2 
Megaohm (the M) with linear (B) taper.
2.) And even if the potentiometers were linear. Changing the 
potentiometers for A D and R from linear characteristics to logarithmic 
will not speed up the envelopes, but would only provide a wider travel 
on the potentiometer for the short envelope times, and a smaller travel 
for the longer times (which would be great nevertheless), but the 
overall speed of the envelope would not be changed.

What you may try to make the envelopes faster is add a parallel resistor 
to the A/D/R-potentiometers.
Check this picture: 
http://fa.utfs.org/diy/korg_monopoly/monopoly_VCF_VCA_ENV_pcb.jpg
Here you can see 470k resistors paralleled to the decay potentiometers 
(this was a test. If you do it permantently you should not leave the 
wires that long).

Florian