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The lead sound can be approximated on an analog modelling synth (or analog monosynth) using:
lowpass filter with cutoff set around 8 and resonance tweaked between 4 and 6
mono + legato mode (if you're using an analog modelling polysynth)
portamento set between 10 and 15
pitch bend set to a full step
onboard (or outboard) delay effect settings of 40 and 40 (for both depth and time)