/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: https://vicanek.de/articles/QuadOsc.pdf
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