They start around 2:53, now that I listen again it's probably more just higher pitched but detuned oscillators as opposed to anything to do with resonance.
AH! Okay, that.
That's the Korg NTS-1. Probably a custom oscillator, but I couldn't tell you which one. And it IS with resonance, also from the NTS-1. I'm not sure if it's the built-in filter or a custom-effect filter. Sorry. It was just all 'in the flow' and I really don't know what all I used or did LOL
The NTS-1 is a surprisingly powerful little beast I tell you. Well worth $100usd. I might pick up another one so I have two effects devices. I bought it primarily as an effects device, but was surprised at how good it can sound with just its single oscillator. Particularly with custom oscillators, of which there's many free one. Free effects as well. Even loopers!
And, yes, filters. Why? Well, the thing is, the audio in signal comes in AFTER the built-in filter. So putting a custom filter in a Mod, Delay, or Reverb user-slot is very useful.