TextGrid file path as a string. If NULL (the default), a TextGrid
is plotted if a TextGrid file with the same name as the wav file is found.
No TextGrid is plotted otherwise.
start
Start time of the plotting window in seconds.
end
End time of the plotting window in seconds. If NULL (the
default), plot the entire duration.
width
Width of the plot in inches.
format
Output file format (png by default, or pdf).
f0
Whether to plot f0 (FALSE by default).
f0_min
If f0 = TRUE, minimum f0 value (0 by default).
f0_max
If f0 = TRUE, maximum f0 value (500 by default).
spec_max
Maximum frequency for the spectrogram (5000 by default).