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Sounds like a good idea, Bob, thanks. Will try that after re-capping the power supply, and doing some continuity testing on KLM-366, as the board seems to have some of the symptoms of KLM-367, i.e. some darkened tracks, some green on resistor legs, one chip which has very blackened legs in the Key assigner section, etc... Touched everything up with some vinegar for now to neutralise the corrosive base from the battery.
Speaking of KLM-366, I was following the VCF Mod line up to CN-05 and I get something like 7.35V to -6.35V on a complete sweep of Cutoff. It looks like I miss a part of the range here although the change is smooth.
However, assuming the range is fine, I tried the Logic Probe on IC15 on KLM-366 because a member mentioned this on one of my previous threads. It appears that on KLM-366 and IC15 ( I forget which pin ) but it warbles, just like the Cutoff/Res does.
This suggested to me that there might be an issue on KLM-366 itself, hence the need to check it out.
Yash