→External links
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* [http://www.elby-designs.com/webtek/panther/euro-frac.pdf EuroSynth – FracRak Comparisons] by Laurie Biddulph, 2015
* [https://web.archive.org/web/20040813222835/http://www.my-scifi-stuff.com/paia/paia_1978.htm 1978 PAIA catalog]
* [http://sonic.net/mjones/paia/index.html PAiA] at Marvin Jones' website, also has some issues of Polyphony
** [http://sonic.net/mjones/archive/docs/index.html#pdocs PAiA documents], Synth & Studio Docs Archive
[[Category:Frac]]
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