IK Multimedia Deep HouseDe essing is also known as "frequency dependent compression," but whatever you call it, the idea is to control excessive sibilance (exaggerated s sounds), which can be particularly problematic on vocal tracks. The multiband capability is a feature that puts the De Esser ahead of the competition making it precise and versatile on top of good sounding. When set as 2 band mode the De Esser works in a broader fashion, effectively reducing the high end