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https://github.com/cookiengineer/audacity
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The main operational difference is that for v4 effect onward, the sound name will now be *TRACK*. This will not affect existing effects since they use version number 3 or less. This also provides the Nyquist effect with much more information about the current processing: Variable Property What *AUDACITY* VERSION current Audacity version number *SYSTEM-DIR* BASE Audacity install path *SYSTEM-DIR* DATA Audacity data path *SYSTEM-DIR* HELP Audacity help path *SYSTEM-DIR* TEMP Audacity temp file path *SYSTEM-DIR* PLUGIN Audacity search path for Nyquist plugins *PROJECT* RATE current project sample rate *PROJECT* TRACKS total number of tracks in the project *PROJECT* WAVETRACKS number of wave tracks in the project *PROJECT* LABELTRACKS number of label tracks in the project *PROJECT* MIDITRACKS number of midi tracks in the project *PROJECT* TIMETRACKS number of time tracks in the project *SELECTION* START start time of current selection *SELECTION* END end time of current selection *SELECTION* TRACKS number of tracks in the current selection *SELECTION* CHANNELS number of channels in the current selection *SELECTION* LOW-HZ low frequency from spectrogram (if available, else nil) *SELECTION* CENTER-HZ center frequence (calculated) (if available, else nil) *SELECTION* HIGH-HZ high frequence from spectrogram (if available, else nil) *SELECTION* BANDWIDTH bandwidth in octaves (calculated) (if available, else nil) *SELECTION* PEAK-LEVEL peak amplitude for the current selection *TRACK* INDEX 1-based index of track being processed *TRACK* NAME name of track *TRACK* TYPE type of track: wave, midi, label, time *TRACK* VIEW track view: Waveform, Waveform (dB), etc. *TRACK* CHANNELS number of channels in the track *TRACK* START-TIME start time of track *TRACK* END-TIME end time of track *TRACK* GAIN track gain *TRACK* PAN track pan *TRACK* RATE sample rate of track *TRACK* FORMAT sample format: 16 (int), 24 (int), 32.0 (float) *TRACK* CLIPS list of start/end times for clips for each channel