Discussion about the Korg PolySix synthesizer

Attaching standalone controls is not too difficult, although the 
following details should be observed:

  The KLM-368 has three logic lines to select effect mode.  If all lines
are low (0V), then the effects are turned off.  Each individual line
enables a particular effect mode: chorus, phase or ensemble when taken
high (+5V).  I am unsure what response happens of more than one mode is
enabled at once.  Chrous mode is CN03-2, phase mode is CN03-3 and ensemble
mode is CN03-4.

  In addition, there are four control voltages.  Effect Speed is achieved 
by using a 50K linear potentiometer with CCW lug at -5V, CW lug at +5V and 
the wiper lug to CN03-1 on the KLM-368.

  There are *3* volume level inputs.  One is to reduce the gain as the 
filter resonance increases, one is the attenuator level as set by the VCA 
attenuator switch and controlled by a 4-bit DAC.  The last input is the 
VCA modulation CV for things like tremolo.  Of these, I would just use the 
VCA mod input and wire the others (CN03-6, CN03-7) to +5V through 1K 
resistors.

  The VCA mod input (CN03-5) can be a potentiometer wired like the Effect
Speed line above.

  The first thing I would do, however, is just try to get the Polysix 
running again.  If you need a new KLM-367 MCU, I have one I can send you 
for cheap.

Crow
/**/

On Fri, 17 Oct 2003, trekpilot wrote:

> problem I have is, what circuits are required to connect the effect
> select switch and level control to the board?  I assume that the effects
> board needs some kind of signal from the programmer section, but I want
> to just connect the pots themselves to the 386A with a minimum of extra
> circuits.  Is there a way to do this using the pins on CN-03?  Please
> help, it would be greatly appreciated.  As a side note, all of the other
> parts from my Polysix are available for sale or trade, I have been
> advised that the Programmer IC is possibly damaged, but all of the other
> boards, pwr supply and case are available.  Please let me know if anyone
> is interested in these parts, and thanx for the tech advice.  Would also
> love to get my hands on a similiar Korg analog machine. Regards,
> 
> T. Cardinal