Pretty much all it is is a synced LFO modulating the filter cutoff on a lowpass filter, sometimes a bit of pitch modulation too, but not too much.
As far as the actual waveforms and osc settings go that's totally up to your experimentation, play around with layering the spectral wave forms over your main saw/square/whatever wave to change up the tops on the sound and play around with different tuning on the oscillators.
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