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 PRETTY CLOSE!!!

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

cheers

2015-11-06 17:29 GMT-02:00 James Bullock Jamie.Bullock@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@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_m5LKOH6QHH2p...

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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