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https://github.com/cookiengineer/audacity
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49 lines
1.4 KiB
Common Lisp
49 lines
1.4 KiB
Common Lisp
;nyquist plug-in
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;version 3
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;type process
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;categories "http://lv2plug.in/ns/lv2core#ModulatorPlugin"
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;name "Tremolo..."
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;action "Applying Tremolo..."
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;; tremolo.ny by Steve Daulton (www.easyspacepro.com) July 2012.
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;; Based on Tremolo by Dominic Mazzoni and David R. Sky."
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;; Released under terms of the GNU General Public License version 2:
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;; http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
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;;
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;; For information about writing and modifying Nyquist plug-ins:
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;; http://wiki.audacityteam.org/wiki/Nyquist_Plug-ins_Reference
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;control wave "Waveform type" choice "sine,triangle,sawtooth,inverse sawtooth,square" 0
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;control phase "Starting phase (degrees)" int "" 0 -180 180
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;control wet "Wet level (percent)" int "" 40 0 100
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;control lfo "Frequency (Hz)" real "" 4 0 10
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; Limit to sensible range
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(setq lfo (min 1000 (max lfo (/ (get-duration 1)))))
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; Convert % to linear
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(setq wet (/ wet 200.0))
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; set tremolo waveform
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(setq waveform
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(abs-env
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(case wave
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(0 *sine-table*)
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(1 *tri-table*)
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; sawtooth
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(2 (maketable (pwlv -1 0.995 1 1 -1)))
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; inverse sawtooth
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(3 (maketable (pwlv -1 0.005 1 1 -1)))
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; square
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(4 (maketable (pwlv -1 0.005 1 0.5 1 0.505 -1 1 -1))))))
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;;; Generate modulation wave
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(defun mod-wave (level)
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(when (= wave 0)
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(setq phase (- phase 90)))
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(sum (- 1 level)
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(mult level
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(osc (hz-to-step lfo) 1.0 waveform phase))))
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(mult s (mod-wave wet))
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