Discussion about the Korg PolySix synthesizer

Hi, got no answer for you, just want so say,
same here, don't know exactly which photo coupler to buy

VTL5C2 (4 pins)
VTL5C3 (4 pins)
VTL5C3/2 (5 pins)

Looking forward to answers,
tuning is not possible with trimpots.

Christian