[PD] recreating FM8 / DX7 in Pd

[Alexandre Torres Porres]

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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