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SergeModular

Index last updated: 2026-04-28 23:13 UTC

Message

Re: Variable Bandwidth VCF & filter options

2001-06-06 by Barry Michael

Has anybody checked out the Modcan filters for
additional options on a Serge? - They are fully patch
compatible. Has anybody heard them?
BarryM

> > : Hello SMOGers,
> > :
> > : Got a question about the Serge variable BW
> filter. I noticed
> that there
> > is
> > : no resonance control on this filter (same as on
> its predecessor,
> the
> > Buchla
> > : 291 VCF). Is there no need for that since you
> can sweep the
> bandwidth?
> > I'm
> > : assuming that sweeping resonance has a similar
> effect as sweeping
> > resonance,
> > : but can someone clarify that for me?
> > : Seeing filters without resonance controls makes
> me nervous.
> > :
> > : Romeo
> > :
> yahoo.com
>
> Hi Romeo
> .
> there is some similarity between resonance &
> bandwith in that
> they both narrow/expand the freq. spread that the
> filter is working
> on , but resonance tends to make a less uniform
> slope to the shape of
> the filter. More resonance tends to make the
> actively processed area
> narrower in bandwidth . The vc slope & vc bandwidth
> filters seem to
> have sensibly chosen resonant settings , plus you
> can create your own
> resonance by feeding the output back in to some
> degree(feeding the
> signal thru in a feedback loop. you can also use two
> filters in
> series , or in parallel , to increase db per octave
> cutoff , double
> resonant peaks etc. Hope my layman speek makes sense
> .
> Also on the 24 db per oct. debate - Are'nt
> there several 1 v
> per o. filters available from a multitude of sources
> ?
> oscillate wildly
> P.K.
>
>


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