It’s attached the the previous mail ;) 

On Saturday, March 24, 2018, Rich Eakin <rtepub@gmail.com> wrote:
Hi there, sorry to raise a dead post..

I'm curious, did you ever end up posting your version of the cpp code somewhere? I'd love to see it if so and try to glean what I can from it.

cheers,
Rich

On Tue, Nov 29, 2016 at 10:53 AM, i go bananas <hard.off@gmail.com> wrote:
Hi, i recently coded it in more 'readable' c++ code.  Can share with you if u want, i guess?

It's a "one pole complex filter", and miller has suggested previously on this list that it is indeed basically a wrapper for the same code as the cpole~ object, with some other stuff thrown in to calculate the coefficients. 

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