Hi all - there was an error in the original implementation of my Virtual Analog Ladder Filter in the App Note AN-4 Virtual Analog Filters. This has been corrected as of 7.8.13. The new App Note has the derivation of the equations I used to synthesize the block diagram.
Sorry for any confusion the original Ladder Filter error caused;
UPDATE: I have created a new Moog half-ladder (2nd order) filter app note that also implements the full 4th order Moog ladder filter.
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