[PD] recreating FM8 / DX7 in Pd

Alexandre Torres Porres porres at gmail.com
Fri Nov 6 20:40:20 CET 2015

it is in fact one of my pedagogical journeys :) but it it great to know
about this james, thanks.

But here's an update. I was running Pd at 32Khz sample rate and didn't
realize it. When I got it running at 44.1 KHz... voilá!!! It does sound

so this mean filter seems about right after all...


2015-11-06 17:29 GMT-02:00 James Bullock <Jamie.Bullock at bcu.ac.uk>:

> Hi Alex,
> DX is really a family of synths which all sound different and work in
> subtly different ways. AFAICT FM8 does aim to emulate any particular synth
> but rather to capture the essence of that family. Some say it is closest to
> the DX7II.
> If you want to get a good DX7 emulation in Pd, I'd recommend using my
> pluginhost~ external along with the excellent Hexter DSSI plugin
> http://dssi.sourceforge.net/hexter.html
> This is going to be more efficient than implementing in Pd, and it
> supports many of the features of the original instrument. The sound is
> mostly pretty close.
> Unless of course this is another one of your pedagogical journeys ;)
> Best,
> Jamie
> On 6 Nov 2015, at 18:51, Alexandre Torres Porres <porres at gmail.com> wrote:
> 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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