The big question I have to ask here is what did you have the resonances set to? It could be a problem...but at the same time, if the resonance controls on the VCFs is set too high, it can start to make a VCF behave like a VCO, which might explain the sweep sounds. Plus, if the ferrites are doing their jobs, that would tend to eliminate external sources as the cause. Try turning the resonance all the way down on those VCFs, then feeding them the sweeping LFO. You also might try feeding the VCFs' modulation via an attenuator between the LFO and VCF, as the incoming LFO might be a little too hot for the VCFs. Just use the attenuator to back down the LFO's level...this will result in a bit less span on the sweeps, but this may also keep the sweep sounds out of the VCFs.
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Got it.