iZotope Mobius FilterAdd motion and energy to your music with Mobius Filters infinitely ascending or descending filter sweeps. Based on the auditory illusion of the Shepard Tone, the Mobius Filter plug in creates perpetually rising or falling effects while maintaining full frequency bandwidth. Add it to any source audio to instantly add motion to your tracks. Mobius Filter creates the sensation of constant movement in your audio by applying the concept of the Shepard Tone