>SSM seems to use this one. Today I implemented all three variants I found >at http://musicdsp.org. I like variation 1 (by Paul Kellett) and variation 2 [ ... ] >Some weeks ago I implemented all filters I found at >http://www.harmony-central.com/Computer/Programming/Audio-EQ-Cookbook.txt >and the peakingEQ is perfectly tuned. I also implemented the simple >resonant lowpass filter proposed by Paul Kellett (used e.g. in terminatorX) >and I was able to tune this as well.
one would hope that you implemented them all as LADSPA plugins so that your hard work can be used by many different audio applications ... --p
