/usr/share/audacity/plug-ins/pluck.ny is in audacity-data 2.2.1-1.
This file is owned by root:root, with mode 0o644.
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;version 4
;type generate
;categories "http://lv2plug.in/ns/lv2core#GeneratorPlugin"
;name "Pluck..."
;manpage "Pluck"
;debugbutton false
;preview linear
;action "Generating pluck sound..."
;info "MIDI values for C notes: 36, 48, 60 [middle C], 72, 84, 96."
;author "David R.Sky"
;copyright "Released under terms of the GNU General Public License version 2"
;; Released under terms of the GNU General Public License version 2:
;; http://www.gnu.org/licenses/old-licenses/gpl-2.0.html .
;control pitch "Pluck MIDI pitch" int "" 60 1 120
;control fade "Fade-out type" choice "abrupt,gradual" 0
;control dur "Duration [seconds]" real "" 1 0.1 30
; original pluck.ny modified by David R.Sky October 2007
; [vastly simplified later]
; to give user option to use [default] abrupt or gradual fade-out,
; and ability to make pluck sound up to 30 seconds in duration.
; Modified January 2007 to use 'snd-pluck' by edgar-rft@web.de
; instead of the Nyquist 'pluck' function, and normalise to 0.8
; maximum amplitude. As defined in Audacity, 'pluck' has
; incorrect length duration and clipping at the start which gives
; rise to DC offset. Using 'snd-pluck' avoids the clipping and
; reduces offset so we don't need the highpass8 filter that we used before.
; Updated to v4 by Steve Daulton May 2015
; set final-amp for abrupt or gradual fade
(setf final-amp (if (= fade 1) 0.001 0.000001))
;; Get length of preview
(setq pdur
(if (get '*track* 'view) ;NIL if preview
dur
(get '*project* 'preview-duration)))
(let* ((pluck-sound (snd-pluck *sound-srate* (step-to-hz pitch) 0 dur final-amp))
(pluck-sound (extract-abs 0 pdur pluck-sound)) ; shorten if necessary for preview.
(max-peak (peak pluck-sound ny:all)))
;; snd-pluck has a random element and will occasionally produce
;; zero amplitude at very high pitch settings. Avoid division by zero.
(if (> max-peak 0)
(scale (/ 0.8 max-peak) pluck-sound)
pluck-sound))
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