Filterbank

Filterbank
-HighPass & LowPass audio filters.-
Video Tutorial
LowPass example
HighPass example
Filterbank is a set of HighPass & LowPass audio filters each with Cutoff, a dry/wet mix (Shelf Filter) and Resonance variables.
The LowPass filter sounds awesome when you hit the pause button in your game and the score is filtered just leaving the bass. This effect is used in the pause menu for Spelunky and when Gomez goes behind a building in FEZ.
The HighPass filter works well when a grenade goes off in Call of Duty and the audio sounds tinny and high-only for a few seconds. It's also used to great effect in the new Zelda game on 3DS when Link passes between worlds.
Bonus Low/High Shelf Filter effect.
As both filters have a dry/wet mix you can extenuate frequencies already in your music and sound effects. If your score is sounding a little light in the lowend, pick out some bass frequencies and dial in some extra fatness. Or if your sound effect could do with some extra topend sparkle, blend in extra high frequencies.