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Rings should be fine as a resonator. However, there's a lot of CV-hungry things in there, and you're definitely going to need at least one (maybe two) buffered mult to prevent voltage sag/detuning across either the VCO or VCF CV inputs. Another thing clearly missing is some sort of random source...you definitely need a noise source, plus some variety of random signal source such as Doepfer's A-149-1 that can derive random CVs from the noise source. Otherwise, this is coming together nicely.