Iacchus

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. 

Hi Dan,
 
nice to have you here hope you will be an active member of our forum, have a look at our demo section, people will be delighted to have feedbacks from an established producer as you are.
 

Hey! I love your music :-)
 
I even have the frogspawn CD in my car! I listen to it quite regularly :-)

MetaSynth image filter does the most impressive stereo enhancement i have ever used
 
But generally, ping pong delay is where most of my width comes from!

Once I'm happy with the settings I send the track or group out and record it back in on 100% wet, then have the verb as a separate track so I can adjust the mix, or filter... often I make it a bit darker, or stick a flanger on it

in ableton i use the track delay to calibrate it with the mix at 50% or so, so i can hear the transients, then i turn up to 100% wet for the record.  Hadnt thought of a way in Bitwig, which Im using now, I shall try your suggestion

in ableton i use the track delay to calibrate it with the mix at 50% or so, so i can hear the transients, then i turn up to 100% wet for the record.  Hadnt thought of a way in Bitwig, which Im using now, I shall try your suggestion

video tutorials by mr.Bill
http://mrbillstunes.com/the-art-of-mr-bill-season-03-out-now/