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Does it really even need the linear to exp convertor ? The feedback loop will force it to the correct frequency. Portamento could just use a different charging function on the capacitor.</div>
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<b>From:</b> Neil Johnson <neil.johnson71@gmail.com><br>
<b>Sent:</b> 05 July 2026 10:26<br>
<b>To:</b> Michael E Caloroso <mec.forumreader@gmail.com><br>
<b>Cc:</b> Mike Bryant <mbryant@futurehorizons.com>; SYNTH DIY <synth-diy@synth-diy.org><br>
<b>Subject:</b> Re: [sdiy] GRP Genesi</div>
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<div style="direction: ltr;">Michael E Caloroso wrote:</div>
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<div style="direction: ltr;">US 3,930,429</div>
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<div style="direction: ltr;">Don did a write-up of it here: <a href="https://till.com/articles/arp/patents.html#US03930429" data-auth="NotApplicable" id="OWAa015bc9b-e899-6bf6-fc26-5073cda34b6d" class="OWAAutoLink">
https://till.com/articles/arp/patents.html#US03930429</a></div>
<div style="direction: ltr;">Very weird architecture indeed!</div>
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<div style="direction: ltr;">Neil</div>
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