[Audacity-nyquist] Updated plug-in: LFO panning 2
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From: David R. S. <dav...@sh...> - 2007-09-08 01:04:33
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* panlfo2.ny: LFO Panning 2 attached to this post Pans your stereo audio selection in Audacity using an LFO [low- frequency oscillator], which is a waveform 20 cycles per second or slower. Much improved over previous version of LFO Panning: with LFO waveform choice, and ability to set leftmost and rightmost pan positions. For Audacity 1.3.3 beta and later, panlfo2a.ny [for improved screen display] is available in a zip file from http://www.shellworld.net/~davidsky/panlfo2a.zip which contains panlfo2a.ny plus help file panlfo2a.txt. Copy panlfo2.ny into your Audacity plug-ins folder. Start Audacity. Load or create a stereo track. Select some or all of this audio. Open effects menu. click on 'Panning [LFO] 2'. Set edit fields as desired. Click on 'okay' button. Explanation of edit fields 1. LFO frequency [hz] default 0.1 hz Frequency of the LFO which pans your stereo audio. If you set the LFO frequency to 1 hz and LFO waveform to 0 sine wave, it will take 1 second to smoothly pan your audio from the starting pan position, to one extreme pan position, to the other extreme pan position, then back to the starting pan position. And it will repeat this pattern for the duration of your selected audio. 2. LFO waveform 0=sine 1=triangle 2=saw 3=inverted saw 4=pulse default 0 sine wave Sine wave pans your audio back and forth smoothly between leftmost and rightmost pan positions. Triangle wave pans your audio back and forth in 'straighter' lines than with sine wave. Sawtooth wave pans your audio in a straight line from leftmost pan position to rightmost pan position, then immediately to leftmost pan position. Inverted sawtooth wave pans your audio in a straight line from rightmost pan position to leftmost pan position, then immediately to rightmost pan position. Pulse waveform pans your audio first to one pan position, then immediately to the other pan position, then back, with no smooth transition between these two pan positions. 3. pulse waveform duty cycle [percent] Used only when pulse waveform is selected. default 50 percent range 1 to 99 percent A square wave is a pulse wave with 50 percent duty - half the time the level is higher than the lower level. A pulse wave with 90 percent duty is higher 90 percent of the time than the lower level. The higher the duty cycle, the more of the time your audio is panned to the rightmost pan position. 4. LFO starting phase [degrees] default 0 degrees range from negative 180 to plus 180 degrees Depending on the starting phase, you willl hear the start of your audio panned to a slightly different location, in the LFO panning cycle. 5 and 6. Leftmost [or rightmost] pan positions [percent] default 5 and 95 percent, respectively The lower either of these values, the further left your audio will be panned during the LFO sweep. Conversely, the higher either of these values, the further to the right your audio will be panned. Notes 1. For proper panning effect, panlfo2.ny combines the two channels of your audio selection into a mono-sounding stereo track before panning it. 2. Due to this mixing of left and right channels, you may hear a drop in volume of your panned audio. Reason: When both channels contain audio at maximum volume and these channels are mixed, when the mixed audio is panned anywhere left or right of center, the signal will become clipped. So the mixed audio is reduced in amplitude by one-half. Compensatory code has been added to amplify the panned signal depending on the setting of the leftmost and rightmost pan positions. 3. You will get an error message: a. If you select mono audio for LFO panning; or, b. if you set identical leftmost and rightmost pan positions. Written by David R. Sky September 7, 2007 http://www.shellworld.net/~davidsky/ Released under terms of the GNU General Public License version 2 http://www.gnu.org/copyleft/gpl.html -- David R. Sky http://www.shellworld.net/~davidsky/ |