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And sophiajoseph is a spam pattern for dumping spam into the forums. But besides that, Mat...you might want to have a look at http://www.happynerding.com/category/fm-aid/ . This is Happy Nerding's module that consists solely of the phase modulation circuit that's the TZFM part of the Schippmann CS-8 VCO, and as such, it might make more sense to approach Schippmann's module after looking at the HN FM Aid's docs. I note, also, that the Schippmann manual is a bit...ah...well, it needs some proofreading, to be sure. Not as bad as yr.typ. 1978 Roland manual, but still...

Hope that helps.