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If I may add a thought to this conversation, I agree that R23 would be the point to insert a CV source. This would replace the internal LFO in the circuit. The variance of the voltage at that point is quite low. I measured a variance of less than about 400 mV. The steady voltage entering from R30 acts to balance the varying voltage from R23. Since the trimmer is used to find the “sweet spot”, any voltage applied from a CV source would need to complement the fixed voltage as the LFO voltage at R23 does. If you were to switch to another effect, the CV voltage might need to be adjusted/changed to fit that circuit.