[sdiy] Other resonator designs

[David G. Dixon]

Ooh, I'm just listening to Scott Stites's Triple Wilson SVVCF.  Nice!  Maybe
that's the one I'll have to build.  However, I'm wondering whether Scott has
found all of the many jacks and knobs on the panel to be useful enough to
justify the expense?  (That's a lotta hardware!)

The two modules really have very different uses, though, don't they?  The
Polymoog one is really more about achieving a certain instrumental sound,
while the Stites one is more about sweeping spacey-ness.

(I think I need 'em both!)



> I'm definitely a fan of resonators, and not just for sweepy, phasey
> filter weirdness. JH has some demos on his site of how well-placed
> filters can make a string sound very much more stringy, and Ken
> Elhardt's polymoog resonator demo shows a similar improvement on some
> basic brass sounds. Most (all?) acoustic instruments include some
> cavity or body that resonates to increase the volume and improve the
> tone. Sounds without this character sound artificial, and that
> (unfortunately) covers a lot of synths. Which is not to say that
> sometimes pure, synthetic, artificial sound isn't what you're after,
> but I like the idea of having a virtual instrument body to tweak
> along with other sound parameters.
> 
> With this in mind, all this discussion of resonators set me looking
> at various schematics for them again.
> 
> There's the PolyKorg version, very simple and based on vactrols, but
> bandpass response only, and no resonance control:
> 
> 	http://homepage2.nifty.com/rjb/pdf/
> rjb_diy_synthe_701a_resonator_schem_revA.pdf
> 
> or alternatively:
> 
> 	http://www.modular.fonik.de/pdf/PS3100.pdf
> 
> Then there's state variable filter based designs, which have all the
> options, but are quite a bit more complicated, like this one, based
> on the MFOS SVF.
> 
> 	http://mypeoplepc.com/members/scottnoanh/birthofasynth/id25.html
> 
> I've done a similar SVF resonator stage myself, based on Roman Sowa's
> Dual SVF design (although I haven't got the LPF and HPF outputs on
> this schematic):
> 
> 	http://www.electricdruid.com/VCResonator.jpg
> 
> (basically just the filter from http://sowa.synth.net/modular/vcf.html)
> 
> The Polymoog SVF design that Florian posted earlier, good but not
> voltage controlled like the ones above:
> 
> 	http://fa.utfs.org/diy/polymoog/polymoog_resonator_schematics.jpg
> 
> Enjoy!
> T.
> 
> 
> 
> 
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