Thanks for your quick reply Bob, I knew this would be a friendly site.
OK, I've checked the PSU output voltages, all is as it should be. So are all the input voltages on all the SSM chips. Also checked the CV for the sustain input which varies correctly, again it's identical for each channel, as is the Cutoff CV.
I have discovered though, that in EG mode, only v0 sounds. In GATE mode, v0, 2, 3 and 5 now sound. v2, v3 and v5 are not as loud as v0 but hopefully this is just a trimmer setting. Do you know where this could be?
My knowledge of this is extremely thin, but I'm getting the terrible feeling that 5 Envelope chips have gone, plus 2 VCOs/VCFs
Anything else I need to be look for or some other ideas?
Thank you again,
Moon