/usr/share/audacity/plug-ins/lowpass.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 24 25 26 27 28 29 30 31 32 33 34 35 | ;nyquist plug-in
;version 3
;type process
;categories "http://lv2plug.in/ns/lv2core#LowpassPlugin"
;name "Low Pass Filter..."
;action "Performing Low Pass Filter..."
;; lowpass.ny by Dominic Mazzoni
;; Modified by David R. Sky
;; Updated by Steve Daulton June 2012
;; Released under terms of the GNU General Public License version 2:
;; http://www.gnu.org/licenses/old-licenses/gpl-2.0.html .
;; To enable the Q control, remove one semicolon from the start of lines 18 and 32
;control rolloff "Rolloff (dB per octave)" choice " 6 dB,12 dB,24 dB,36 dB,48 dB" 0
;;control q "Filter quality (Q) for 12 dB rolloff" real "" 0.7071 .1 20
;control frequency "Cutoff frequency (Hz)" real "" 1000 1 20000
(cond
((> frequency (/ *sound-srate* 2))
(format nil
"Cutoff frequency is set at ~a Hz but must not~%~
be greater than ~a Hz (half of the track sample rate)."
frequency
(truncate (/ *sound-srate* 2.0))))
((<= frequency 1)
(format nil
"Cutoff frequency is set at ~a Hz~%but must be at least 1 Hz."
frequency))
; ((= rolloff 1)(lowpass2 s frequency (max (min q 20) 0.1)))
(T
(funcall
(nth rolloff '(lp lowpass2 lowpass4 lowpass6 lowpass8))
s frequency)))
|