That looks like it's using openGL for the graph, so you need to build
Snd --with-gl --with-motif (it might also work in gtk). Then as Kjetil
says, get the spectrum full-window, select spectrogram in the transform
options dialog, and gray in the color/orientation dialog; it looks like
they've set the y-axis angle to 130 and maybe used the spectrum-end
scale to cut out the highest frequencies. Once you have the
saved-snd.scm
file, you can wrap the file part in a for-each to handle all your files
in sequence. I think they also set the "light-dark" scale to make it
darker.
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