JP8000 DSP clone

[Tony Hardie-Bick]

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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