M4GIQ
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M4GIQ is a 4-band multi-fx plugin that lets you apply Gain, Panning, and Delay to each frequency band. This is extremely useful for spreading frequencies across the stereo image, making it easier for the sound to cut through. You can shape the sound further with the Gain controls and High-pass/Low-pass filters. Delay can also be added to make an interesting effect, or to emphasize the spreading of frequencies. Screenshot

For Windows XP, Vista, 7