Originally Posted by Brainchild
Some kind of modulation for sure, sounds like it's going through a chorus effect with a really slow rotation rate. It also sounds like there's a second oscillator down there a bit.
Dunno (or care)
what was used, but one of the tricks to getting lush sounds out of the the evolver is modulating the delays, especially when linked to sequencer steps, so they can go way slow.
Thankfully, the delays aren't analog or tape modeled so changing their speed doesn't get those artifacts!