Discussion about the Korg PolySix synthesizer

Hello Ells,

good. Then:
The common part between Manual/Write and LED#8 is the Databus D07. This 
signal is provided by IC30 on the CPU Board (KLM367). I can imagine, 
that the Modulation assignment (MG to VCF or VCA) won't work too or 
works wrong, but you will not recognize if you are working with presets 
mosttimes.

I would check the signal on IC30 pin8 with an oscilloscope and compare 
it with IC30 pin 6.

If it is always high or always low, then replace IC30.

If there is a changing signal, the check pin 12 on the connector CN10 on 
KLM367, then pin 12 at the connector on the KLM371, and finally at the 
switches and at pin7 at IC5 on the KLM371.

Florian