Copy and paste the code below into the “Nyquist Prompt” which is in the “Effect” meun …
(setq mysound s)
(setq q 10) ; set the base Q for the filter
(setq iter 10) ; set the number of iterations
(setq freq 970) ; set base frequency
; start the DO loop
(dotimes (i iter mysound)
(setf mysound (notch2 mysound (* freq (1+ i)) (* q (1+ i))))
) ;end of loop
Applying the above code removes the main whine, (which is a 970Hz fundamental and 10 harmonics),
the above code does not remove hiss-noise or the weird bleat which comes in at 0.9 seconds.
[ code originally from here … https://forum.audacityteam.org/t/multiple-notches-with-nyquist-prompt/7583/3 ]