Do you mean the "warbly" part before the synth lead comes in?

I made 2 parts. The first I just used a saw with LP filter, cutoff of 96. It's just a low drone.
The "warble" I also used a saw, LPF cutoff 27. Triangle LFO, speed 43 with pitch mod 78 and filter mod 91.

Those 2 parts an octave apart. It sounds pretty dang good to me, considering it took 2 minutes. I'm sure it would benefit from FX.
I thought I could attach an mp3 here but it won't let me.

Thanks Mitch,

I'll give that a go.

I'm interested to know how to get this kind of skill, as it would be quicker than spending hours going through presets.

I'm still far from great at it. I just try to break a sound down into components. There's a sound I'm trying to recreate that's driving me nuts. I just can't get it right.

If you can find Rob Papen's Book/DVDs "The 4 Element Synth," It's awesome. It's out of print and mine got lost in my last move.
But if you can find it used, it's very good.

You can also look for a subtractive synthesizer soft synth for your computer. That will give you all the knobs and envelopes in one place to play around with.