/usr/share/audacity/plug-ins/notch.ny is in audacity-data 2.0.5-1ubuntu3.
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 | ;nyquist plug-in
;version 1
;type process
;categories "http://lv2plug.in/ns/lv2core/#FilterPlugin"
;name "Notch Filter..."
;action "Performing Notch Filter..."
;control freq "Frequency" real "Hz" 60 0 10000
;control q "Q (higher value reduces width)" real "" 1 0.1 20
;; notch.ny by Steve Daulton and Bill Wharrie, September 2010.
;; Released under terms of the GNU General Public License version 2:
;; http://www.gnu.org/licenses/old-licenses/gpl-2.0.html .
;; (multichan-expand) provides legacy support for old versions of Audacity
;; in which the (notch2) function only supports mono tracks.
(cond
((> freq (/ *sound-srate* 2.0))(format nil "Error:\nFrequency too high for track sample rate."))
((< freq 0)(format nil "Error:\nNegative frequency is invalid."))
((< q 0.01)(format nil "Error:\nWidth must be at least 0.01."))
((= freq 0) (format nil "Nothing to be done."))
(T (multichan-expand #'notch2 s freq q)))
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