the effect is not just..an effect! It's a complex aggregation of different fx that will require a lot of different testing possibilities.
-hi amount of diffusion
-possibly eq/filtering of some kind
there are many ways these effects can be built and the unit's presets are the learning tools.
For panning delay try lfo modulating 2 ampmods in opposite pattern, fed by a delay w/mix for feedback.
Diffusor: try using 4 voice at least. Don't use gains higher than -/+ 0.5.
Flanging : moddelay or microdelay with mix for feedback. Modulated by an Lfo.
Reverb : a Reverb C would be enough here.