What does PTF stand for?

MLA style: "PTF." Acronym Finder . 2013. AcronymFinder.com 26 May. 2013 http://www.acronymfinder.com/Per_Tone-Filter-(PTF).html
Chicago style: Acronym Finder . S.v. "PTF." Retrieved May 26 2013 from http://www.acronymfinder.com/Per_Tone-Filter-(PTF).html
APA style: PTF. (n.d.) Acronym Finder. (2013). Retrieved May 26 2013 from http://www.acronymfinder.com/Per_Tone-Filter-(PTF).html

Per-Tone Filter

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