I’m sorry if this isn’t the place to post bugs on the webpage, I didn’t find another.
The signaldisplay document entry which can be reached from fftdisplay document, is pointing to a Page not Found exception. The correct document entry can still be reached through:
http://cabbageaudio.com/docs/signaldisplay/
Might I also suggest adding signaldisplay into Cabbage Widgets, under Cabbage Docs.
Cheers.