JP8000 DSP clone

[Joost Schuttelaar]

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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