/usr/share/audacity/plug-ins/notch.ny is in audacity-data 2.2.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 | ;nyquist plug-in
;version 4
;type process
;preview linear
;name "Notch Filter..."
;manpage "Notch_Filter"
;debugbutton false
;action "Applying Notch Filter..."
;author "Steve Daulton and Bill Wharrie"
;copyright "Released under terms of the GNU General Public License version 2"
;; notch.ny by Steve Daulton and Bill Wharrie
;; Released under terms of the GNU General Public License version 2:
;; http://www.gnu.org/licenses/old-licenses/gpl-2.0.html .
;control frequency "Frequency (Hz)" float-text "" 60 0 nil
;control q "Q (higher value reduces width)" float-text "" 1 0.1 1000
(cond
((< frequency 0.1) "Frequency must be at least 0.1 Hz.")
((>= frequency (/ *sound-srate* 2.0))
(format nil "Error:~%~%Frequency (~a Hz) is too high for track sample rate.~%~%~
Track sample rate is ~a Hz.~%~
Frequency must be less than ~a Hz."
frequency
*sound-srate*
(/ *sound-srate* 2.0)))
(T (notch2 *track* frequency q)))
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