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About Factor Home Catalog Custom Options Strings Restoration & Repair Players Sound Clips About Factor Contact If you would like to "D" tune your "E" string almost instantaneously..., without changing string tension and not having to transpose, then the Ex Factor is your only choice.The Ex Factor extended string bass and Factor 4 got its name from ergonomics..., the study of the relationship between people and their working environment. Also known as Human Factors, this science was the foundation for the engineering parameters...