Korg Mono/Poly

Hello Alain


> I've simply disconnected one wire (pin 1) on 
> connector 18 of KLM-355C (filter board) that was bringing the 
> keyboard CV coming from KLM-356D to the filter. 
Attention:
The pinout has inverted between old and new version of KLM355 (You must 
read this with a monospace font like courier):

              PinOLD PinNew
KEYBD-TRACK    1      3
SINGLE-TRIG    2      2
MULTI-TRIG     3      1

> So the glide times are identical to that of VCO 1.
This will be useful only in Unisono and Chord-Memory modes!!! In 
Unisono/Share and Poly modes the VCF should follow the CV of the highest 
VCO (that is what pin20-1 is delivering) - which is not necessarily 
VCO1. In the opposite: VCO1 is typically the lowest note (in Unisono/Share).

> Korg should have added a portamento feature to the filter cutoff 
> in the first place (as on many Moog synths).
I think Korg did it because of the mentioned dependency. And also they 
used a fourfolded potentiometer, which is already difficult to get, but 
a fivefolded seems close to impossible

The better solution would have been (or would be) to establishe five 
voltage controlled portamentos, where the fifth portamento affects the 
KBD voltage of pin20-1/3

Florian