[PD] recreating FM8 / DX7 in Pd

James Correa jcorrea.mus at gmail.com
Fri Nov 6 20:01:03 CET 2015

Hi Alexandre,

Someone a long time ago made a DX7 in Csound, don't remember names but I
might have it in somewhere. If I find I'll send it to you, may be will help



On 6 November 2015 at 16:50, Alexandre Torres Porres <porres at gmail.com>

> here's the discussion from the forum, I could also try reviving that
> thread :)
> http://forum.pdpatchrepo.info/topic/6185/feedback-fm-algorithm/2
> 2015-11-06 16:49 GMT-02:00 Alexandre Torres Porres <porres at gmail.com>:
>> Howdy, I'm just trying to understand how the Feedback modulation works in
>> FM8 (from NI) and how it really is the same as in DX7. I'm actually also
>> using SuperCollider, which provides a self modulating oscillator
>> (SinOscFB), but it just burst and blows up in noise way before the FM8 does
>> with the same modulation index. I've made an equivalent patch in Pd for
>> SinOscFB. Now, I know that in Supercollider there is no filter in the
>> feedback, and I was researching around the web and found out about the DX7
>> patents where they described the usage of a mean filter in the feedback
>> loop. Here's the patent
>> http://www.google.com/patents/US4249447?dq=4249447&ei=7vK4T_m5LKOH6QHH2pTsCg
>> this was actually discussed in a Pd Forum. I tried the mean filter in the
>> feedback loop, but it doesn't really sound closer to FM8's self modulating
>> oscillator. FM8 is supposed to be a kind of perfect clone to DX7. I don't
>> have a DX7, but I have FM8, so I'm using it as a guide to recreate DX7
>> patches in Pd.
>> This may be a long shot, but I wonder if anyone out there could help me
>> out nailing the perfect sound and behaviour of the self phase modulating
>> oscillator.
>> thanks
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