Try this input :
VCO 1V/OCT INPUT
This is a 1V/Octave Exponential frequency modulation input that is summed
internally with the VCO FREQUENCY control, the Keyboard CV and any VCO
frequency modulation. With all internal control signals at 0V, a -5 to +5V control
voltage at this input will sweep the VCO frequency from 8Hz to 8kHz (10 Octaves).
Did you succeed to sync Moog's LFO ?