[sdiy] GRP Genesi

[S Ridley]

Jeremy Hill talks about designing the ARP Pro Soloist on namm org:

https://www.namm.org/library/oral-history/jeremy-hill


Steve


On Sun, 5 Jul 2026 at 20:03, Michael E Caloroso via Synth-diy <
synth-diy at synth-diy.org> wrote:

> My error - the VCO charged cap core is inside the feedback loop.
>
> It is indeed a weird architecture - Jeremy Hill was really thinking
> outside the box!
>
> MC
>
> On Sun, Jul 5, 2026 at 10:01 AM Mike Bryant <mbryant at futurehorizons.com>
> wrote:
>
>> 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.
>>
>> ------------------------------
>> *From:* Neil Johnson <neil.johnson71 at gmail.com>
>> *Sent:* 05 July 2026 10:26
>> *To:* Michael E Caloroso <mec.forumreader at gmail.com>
>> *Cc:* Mike Bryant <mbryant at futurehorizons.com>; SYNTH DIY <
>> synth-diy at synth-diy.org>
>> *Subject:* Re: [sdiy] GRP Genesi
>>
>> Michael E Caloroso wrote:
>>
>> US 3,930,429
>>
>>
>> Don did a write-up of it here:
>> https://till.com/articles/arp/patents.html#US03930429
>> Very weird architecture indeed!
>>
>> Neil
>>
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