Serum is actually my go-to VST, but I've never gotten the hang of getting that kind of warble out of it (although chaos mod on fine tune gets close). I've started using another plugin to add it afterwards to get what I'm looking for.
Man, did you go to that link I put up for you on the last page you commented on? Trance Drive.... its a free synth... I made the track on my current signature entirely from it bar the kicks and percussion... It isn't bad for free..
This is dope man. I actually want to here somebody rapping over this even though it probably wasn't intended for that.