I had some time today to derive the model for the Korg35 HPF, a very interesting filter; 2nd Order yet the rolloff is 6dB/oct instead of 12dB/oct. This App Note describes how to get that to happen and of course a sample project is also included.
UPDATE: 8-15-13 I have greatly simplified the Korg35HPF model while still retaining the same frequency response characteristics. The original did not have errors, but required more filtering components. This version only requires three filter blocks and is simpler to understand and implement. The document is labeled App Note 7A.
If you have any questions feel free to post them here.
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