[sdiy] Buchla filters (was DAF)

[Sebastian Kuehnl]

--- Florian Anwander <Florian.Anwander at consol.de> wrote:
> Hi Martin 
> 
> > For some of the brassy filter sounds i can't believe it was a 12dB LP
> > filter, sounds like a juicy 24dB filter. I always *thought* it was a
> 100M.
> > Maybe equipment was different in studio...
> One thing now I remember, is that Goerl was for a long time the only
> person I learned to know, that already knew about what I call the
> VCFselfModulationTrick: you are using only one VCO, then you may
> modulate the VCF in addition to the env also with the saw signal of VCO.
> If you raise the resonance, this sounds similar to a more steep filter.
> 

Your mentioned trick is the basic but crucial routing in S. Ciani's famous
7-up ad soundtrack (sound of pouring limo into a glass). That is, at least
*I* got an essentially very similar sound with it - since Ciani did it on a
Buchla 200 system I'm wondering about the FM part, so by the occasion, a
question to Buchla-players: I suppose she used the bandpass model 291 because
the 292 lopass-gate circuitry would be too slow for this FM (according to
Grant Richter, 200 Hz is max). I know that it goes down to 30 Hz with range
adjustable from a semitone to four octaves. That's quite a special BP which
as evident in the ad can make for a very decent LP - will someone explain the
concept behind this to me: I had been thinking the 292 was the "main" filter,
but then, isn't it, the "frequency gating" idea simulating a quite natural
overtone behaviour, more intended as the polishing final part in the chain?
I'm curious.

Obviously, how can the apparently corresponding Serge combo VCFS (to my
understanding can do another sort of frequency gating) and VCF2 (var. bwidth)
be described in comparison?

Kind regards,
Sebastian Kuehnl


> -- 
> Florian Anwander                  |ConSol*  HP-Support
> Tel.   +49.89.45841-133           |Consulting&Solutions Software GmbH
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