I'm not smart enough to help, but given your detailed description, I think there might be someone over at the Sound on Sound forum who could at least give you pointers. Try posting at:
Forum - Main Forums : DIY, Electronics, Studio Design & Acoustics
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Attachemnts are not possible, but links are, like you did above. There are several useful guys on there, but Folderol, Nathanscribe and Hugh Robjohns are some of the most knowledgable on synth (and other) circuitry.
Hope that helps :)