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The wiki needs an overhaul and so any information, corrections, etc are greatly appreciated.
There is a js based spectrogram made by Sumi included in the site. It can be found below.
This has been updated, and you can find the old version at: oldspec.sumianvoice.com
Open the spectrogram
How To Read a Spectrogram
See explanation here
You can set a pitch floor by specifying a minimum pitch (in Hz) which will cause the program to beep annoyingly whenever the sound drops below the set value.