There's a lot of sounds going on it that so not sure if you are referring to one in particular, they're mostly a standard set of psychedelic 'squelches'
These sounds are generally made with saw waves, and band pass filtering with lots of resonance.
What synth(s) do you have? Here's a tutorial to make the basic psytrance squeak on sylenth, a good place to start.
You can push different synth in different ways to get better or more varied squelches.. ring modulation, formant filtering.. I could give you a few tricks for a Virus and could give you a patch using the Bitwig polysynth.