[PD] filter stability

[Alexandre Torres Porres]

hi list, I'm using a 2nd order lowpass resonant filter whose coefficients
I'm getting from the famous Eq-cookbook and using it inside a feedback loop
to implement karplus-strong.

I also have a coded object for that (pluck~) and the 'q' parameter is 0.5,
which is a "safe" setting, i.e. the filter doesn't get unstable and blows
up.

I was now trying to find a higher 'q' coefficient but it's hard to know
where I can go "exactly" just under it could blow up.

Is there an easy way to know this other than trial and error?

thanks
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