Well, one of my voices just died as described. Took it out, checked but it started to work again so impossible to trace the cause. Now when i have installed the voice card back it died again lol...
No output on 0 terminal (out) Now its really dead. I have traced the problem to the IC2 (the EG amp). It has no output. When i turn the VR17 more (initial level) the voice is sounding so I think the card is mostly ok...the problem is envelope / trigger related (TRG boards??). I will investigate more tomorrow.