say -v Alex "Hello"
Is there a way to change the speed of speech like there is in the speech settings of System Preferences -> Date & Time -> Clock -> Customize Voice?
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There is also an embedded speech command for changing the rate:
say '[[rate 200]] hello'
FWIW: I'm on Big Sur and the
--rate is simply ignored. However, the embedded command as described by @lri still works.
P.S. I see in an earlier comment that 10.13 also had that issue. Well...