[PD] recreating FM8 / DX7 in Pd

Alexandre Torres Porres porres at gmail.com
Fri Nov 6 20:14:48 CET 2015


here's my patch anyway

2015-11-06 17:01 GMT-02:00 James Correa <jcorrea.mus at gmail.com>:

> 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
> you.
> Abra├žo,
> James
> On 6 November 2015 at 16:50, Alexandre Torres Porres <porres at gmail.com>
> wrote:
>> 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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