Bug id=152 http://bugzilla.audacityteam.org/show_bug.cgi?id=152
can be prevented from rearing its ugly head by adding the following line
344 (defun nyq:biquad (x b0 b1 b2 a0 a1 a2)
+345 (if (< a0 1.0)(error (format T "a0 < 1 in biquad~%"))
346 (let ((a0r (/ 1.0 a0)))
This is not a fix, just a workaround, but it prevents the worst effects
of the bug.
I suspect the main bug may be related to dither, but that's beyond me.
Perhaps dispprisms.lsp should contain checking that filters do not
attempt to operate at frequencies above half the sample rate?
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