The EarthQuaker Devices Orbiter pedal is truly out-of-this-world. It's a dual resonant filter, controlled by a single LFO, sweeping in opposite directions. And if that doesn't rip your brain apart, you can tweak each filter individually, and the overall rate & frequency to your liking to create the most unique sounds possible.
Hear it in now:
EarthQuaker Devices Orbiter Features:
EarthQuaker Devices Interstellar Orbiter Instruction Manual