Have you checked the DVD chapters in the book? I did a chapter on 
digital filters covering 2nd-order schemes, most especially the Robert 
Bristow Johnson recipes, with example implementations.

Richard Dobson


On 17/02/2017 04:10, Emmett Palaima wrote:
> Hi, I'm doing some audio programming in C, and I'm looking for a simple
> 2nd order lowpass filter design I can implement. Not looking for
> anything too fancy, just need something like the Tone opcode but with a
> steeper cutoff. I was looking in the Audio Programming book but it only
> covers 1st order IIR filters.
>
> Any suggestions?
>
> Thanks!
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