> Today I discovered that SpiralSynthModular has a Moog VCF. From the > Stilson paper (http://ccrma- > www.stanford.edu/~stilti/papers/moogvcf.pdf) I learned that > digitizing the Moog VCF is a nontrivial problem. So I would like to > ask two questions > > 1) On which papers/information/sample code is the Moog VCF in SSM > based ?
It's pinched from here: http://musicdsp.org/ (an extremely good site btw) And indeed, it's apparently from the Stilson/Smith CCRMA paper and the same as the one used in CSound. There are also a couple of variations that look interesting. > 2) Is there a cookbook document for the Moog VCF ? > > A question I don't want to ask: Are there any patents in conjunction > with the digital implementation of this filter (the "original" > Filter was patented by Moog in the sixties) ? There is a patent on the hardware ladder vcf, but I don't know about the software (erm, hope not.. :)) Dave : www.pawfal.org :
