Thanks so much Florian. The MG actually works fine in all modes (VCO, VCF and VCA) which is good I suppose. Would that make any difference?
Great to know how to narrow down the problem to the IC30 on the KLM367 board. I don't have an oscilloscope to test the IC30 though unless there's a osc probe to PC soundcard adapter and something like PicoScope software?
They always had computer/ham radio fests near me with used oscilloscopes; too bad I never got one. May try online.
At the very least you narrowed it down for me and I can see about getting a hold of an oscilloscope and if your diagnosis plays out replace the IC30 myself. I'm not much of a tech but I've built computers and such so this wouldn't be much of a stretch.
Thanks again!!!
Ells