This looks great.

Thanks, Martin.



On Thu, 21 Feb 2019 at 19:33, Martin Vicanek <> wrote:

> *Ian wrote:
> Every time you modify the filter coefficients, modify the state of the 
> **filter so that it will produce the output you are expecting. Easy to do.
> *Ethan wrote:
> A very simple oscillator recipe is [the coupled form]. However, it's not 
> stable as is, so you periodically have to make an adjustment to make sure 
> that a^2 + b^2 = 1.
> You can have both: A (hyper)stable quadrature oscillator without the need to 
> adjust states upon frequency modulation, and without the need to counteract 
> amplitude runaway:
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