This may be the most powerful, funkiest filtering effect imaginable. An envelope follower uses the dynamics and amplitude of the incoming audio to modulate the cutoff frequency of a filter -- and the result is a funky, liquid filtering effect that responds to your musical material. 
10-Band EQ with Multiple EQ Types; Brickwall Low & Hi-Pass Filters; 2 Compressors & a Gate. Image-Line DirectWave VSTi Sampler (Electronic Download). Cool edit pro 21 portable free download.
The signal is split into mono (Mid) and stereo (Side) signals, and each part can be boosted or attenuated to create panoramic 3D effects. With 9 filter types, ring modulation, and analog distortion effects available, the sonic potential of this plug-in is huge. A good gate effect is critical for removing noise and mud from a mix.
Gates remove the hiss and noise from areas of a track that have no desirable sound, such as the spaces in between vocals or guitar parts. The best gate effects let you filter the audio so only certain frequencies, such as a bass drum, will trigger the gate. TB Gate is no exception. With well laid out controls and metering, it's easy to dial in settings that will leave your audio untouched while perfectly removing the unwanted silence in between.