Eventide PitchFactor  From Eventide

Eventide is a fairly small but highly inventive digital audio effects design company, which has gradually been building one of the most respected names in the industry. In some ways the most sophisticated digital effects processors on the market, the Eventide series processors boast more effects algorithms than any of the competetive effects boxes in their price range. Due to the range, and processing power of their boxes, the Eventide processors often have the qulaity and variety of effects rivaled only by combining several different competitor boxes each costing as much as what you would get with an Eventide!