JP8000 DSP clone

[Jay Vaughan]

Good idea. Target Zynthian please. 

;
--
seclorum 

> On 06.01.2026, at 21:55, Joost Schuttelaar via music-bar <music-bar at lists.music-bar.org> wrote:
> 
> It was a very very cool video and yeah, this fragment stood out. It reminded me of this Faze 1 Audio Unit I was creating 15 years ago, where I simply solved the phase distortion aliasing by running the oscs at 8x the sample rate with a brick wall filter… worked great.
> 
> I should put Claude to work to port that old code to something that runs on a raspberry pi…
> 
> Sent from my iPhone
> 
>> On Jan 6, 2026, at 17:41, Tony Hardie-Bick via music-bar <music-bar at lists.music-bar.org> wrote:
>> 
>> Nice resource!
>> 
>> So here's a piece of super-poetry from
>> https://media.ccc.de/v/39c3-from-silicon-to-darude-sand-storm-breaking-famous-synthesizer-dsps
>> 
>> int24_t saw[7] = {0};
>> 
>> const int24_t detune_table[7] = { 0, 128, -128, 816, -824, 1408, -1440};
>> 
>> int24_t next(int24_t pitch, int24_t spread, int24_t detune) {
>> 
>> int24_t sum = 0;
>> 
>> for (int i = 0; i < 7; i++) {
>>   int24_t voice_detune = (detune_table[i] * (pitch * detune)) >> 7;
>>   saw[i] += pitch + voice_detune;
>> 
>>   if (i == 0)
>>     sum += saw[i];
>>   else
>>     sum += saw[i] * spread;
>> }
>> 
>> return high_pass(sum);
>> }
>> 
>>>> On 06/01/2026 03:11, Jay Vaughan via music-bar wrote:
>>> It’s from last years CCC, it’s pretty much not rubbish and is an
>>> excellent discourse on the approach they took to reverse engineering the
>>> weird ESP chip .. if you haven’t watched the CCC sessions, they are
>>> definitely worth picking through:
>>> 
>>> https://media.ccc.de/b/congress/2025 <https://media.ccc.de/b/congress/2025>
>>> 
>>> As a recent convert to the Flipper/Pinball sport, I found this one
>>> particularly interesting as well:
>>> 
>>> https://media.ccc.de/v/39c3-wie-wir-alte-flipperautomaten-am-leben-
>>> erhalten <https://media.ccc.de/v/39c3-wie-wir-alte-flipperautomaten-am-
>>> leben-erhalten>
>>> 
>>> Some of the old pinball machines have some amazing sound design …
>>> 
>>> j.
>>> —
>>> Jay Vaughan
>>> 
>>> 
>>>> On 05.01.2026, at 21:25, Peter Korsten via music-bar <music-
>>>> bar at lists.music-bar.org> wrote:
>>>> 
>>>> Op 30-12-2025 om 11:37 schreef Joost Schuttelaar via music-bar:
>>>>> Those 56K guys are at it again. Now a clone of the original Supersaw,
>>>>> the JP8000:
>>>>> 
>>>>> https://dsp56300.wordpress.com/je8086/
>>>> 
>>>> While on the subject, this showed up in my YouTube feed:
>>>> https://www.youtube.com/watch?v=XM_q5T7wTpQ
>>>> 
>>>> It's a 40 minute presentation by the guys behind this project.
>>>> 
>>>> I just started watching it now, so it could be rubbish for all I know. 🙂
>>>> 
>>>> - Peter
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>> 
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