Hello !

Thanks a lot everyone. Thanks for the book info Vadim.
I was not notified that this thread was going on, so I forgot it.
I managed to make something work, but sonically speaking, it was far from a
moog filter :-)

The appearance/disappearnce of the resonance effect was pretty brutal, and
with a kind of veil on the higher frequencies.
I should have taken a screen shot of the "circuit" (the interconnected
modules, mix, feedback, and may be gain). But I think I was too ashamed of
my first attempt  :)
I had to do something else (much much easier = a 4*32 step sequencer with
many modulators and triggers)  that controls eurorack, using a scope dsp
card, and a exprt sleepers converters, no sound magic involved . :-)
I've also been educated to dsp cards with development kits, for pretty
cheap prices (compared to when I last checked 10 years ago).
but right now i will try native tools to try to translate what i've build

To be continued ....

(for examples of what i've been "building" or putting together)

Le lun. 23 juil. 2018 à 11:42, Vadim Zavalishin <
vadim.zavalis...@native-instruments.de> a écrit :

> On 20-Jul-18 18:13, Mehdi Touzani wrote:
> > So... how do you do a resonance in a lowpass circuit?   :-)   not the
> > math, not the code, just the architecture.
> There are many different ways to create resonance in a lowpass circuit
> (esp. if the order is larger than 2). The higher is the order of the
> filter, the more different answers there are.
> Making a feedback loop around a lowpass chain is one way, but AFAIK it
> works perfectly (or close to that) only for the 4th order filter (the so
> called Moog ladder). I'm not aware of any standard generic structure (or
> even a transfer function to begin with) which could be referred to as a
> generic Nth order resonating filter. Recently I tried to propose one way
> of generalizing the 2nd order resonance to an arbitrary order by what I
> called "Butterworth filters of the 2nd kind", but this involves just the
> transfer function, whereas you still have lots of freedom in the
> implementation structure. You could look into the latest revision of my
> book for more details (where I also explain the problems with the
> lowpass feedback).
> Regards,
> Vadim
> --
> Vadim Zavalishin
> Reaktor Application Architect
> Native Instruments GmbH
> +49-30-611035-0
> www.native-instruments.com
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