I've made a bit of headway with this - using several fffb~ objects (as the maximum number of filters per object is 50).
The only thing that I am struggling with now is the filter frequency ratio - I notice that the 1/3 octave eq quotes this as "A third-octave equalizer has a frequency ratio of the cube root of 2, i.e. 1.259921…"
I'm not sure as to where this number comes from - or the calculation to find the ratio for narrower bandwidths.
The best narrow eq i have used is reapers 'rea eq' you can select an individual frequency from a noisy sound file. its pretty incredible.
it's free. States : "Freely usable". 32 bit and 64bit available. win and mac too I believe, but may need to download reaper for mac? needs some googling.
I am wondering, does "free to use" mean one can incorporate the eq in their patch vst~ and distribute on line as a free to download standalone? I ask this, as I am after a narrow eq for my patch too. Hence I found this thread. I just wonder about legal issues with ReaEQ..