wet filters, dispersion

Apr 18, 2007 at 2:16pm

wet filters, dispersion

so i’m interested in getting traditional subtractive synthesis sounds out of
max, and i’ve got a whole CV scheme biult with virtual ‘modules’ and such.

I’d like to make some filters that sound a little better/more interesting
than the stock svf, biquad, etc. I looked into the mcgill nord modular
online book, and they suggested that ‘dispersion’ was one thing that would
help to get ‘wet’ sounding filters.

http://www.cim.mcgill.ca/~clark/nordmodularbook/nm_filters.html#wet

I’ve tried doing some crossovers and doing my dispersion that way, but what
i’d like to try is to get some kind of dsp object that had a very non-linear
phase response but a fairly linear amplitude response, and put that inside
an explicit feedback path to the svf~ doing the actual filering.

Any info on making dispersion and/or improving the stock filters?

the desired finished product here would be an filter abstraction that would
respond to frequency and Q input, and maybe some third ‘analog feel’
parameter.

thanks,
George

#31450
Apr 20, 2007 at 7:03am

George Locke schrieb:
> I’ve tried doing some crossovers and doing my dispersion that way,
> but what i’d like to try is to get some kind of dsp object that had a
> very non-linear phase response but a fairly linear amplitude
> response, and put that inside an explicit feedback path to the svf~
> doing the actual filering.

You should look into [allpass]…

> Any info on making dispersion and/or improving the stock filters?

There was just recently a long thread about the same issue…

> maybe some third ‘analog feel’ parameter.

like porn < ---> real s… ?
dry < ---> wet

(sorry couldn’t r…)

Stefan


Stefan Tiedje————x——-
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#102344
Apr 20, 2007 at 9:19am

look for the ms20 filter thread in this forum. there’s a cool patch made from standard msp objects to get that “porn” feel… (i presume that’s what stefan had in mind – the patch not the porn! ;))

however that’s not using dispersion techniques to get that wet nord filter sound. allpass~ or some sort of random short delays in the feedback stage might get you closer… perhaps u can look at some of the diffusion techniques used in reverbs to get some ideas.

j

#102345
Apr 20, 2007 at 10:31am

theres lots of ideas in the article you posted. try connecting up biquads in various configurations. use distortion between them, try feedback, try using staggered cutoff frequencies, vary the resonance with the cutoff, vary distortion with the cutoff. each low pass biquad is a 12db (2 pole) filter. so two in series gives you 24db (4 pole) .
the frequency dispersion moistness sounds dubious to me, but try that too! then write back and tell us what sounds good

#102346
Apr 20, 2007 at 6:49pm

Wooh! Thread link! WOOT PORN FILTER :D yeah I love that sexy bass analogue filter feeling mmmmmmmmmm
sexy mmmmmmm bass

http://www.cycling74.com/forums/index.php?t=msg&goto=100547&rid=0&srch=ms+20+filter#msg_100547

;)

Id love to see what you come up with for the nord. I loved the filters on that. I also was really into their FM sound, I was planning on trying that out soon too.

#102347

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