I want to change the speed of my text to speech. I know I can do this via preferences like this:

enter image description here

However, I want to configure this setting via the command line. How can I set the speaking rate via the command line?

I know it's possible to change a lot of the settings using the defaults command like:

$ defaults write -g InitialKeyRepeat -int 13 

However, I can't find any listings for how to change the value of speaking rate. If anyone has information on how to figure out the required key and value for the defaults command that would also be hugely helpful.

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