Question: ```
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*?

![enter image description here](https://i.stack.imgur.com/XpeWm.png)

Answer: 
Yes, there is. The command

```
say -v Alex "Hello" -r 200

```

will cause the voice Alex say "Hello" at a rate of 200 words/minute.
There is also an [embedded speech command](https://developer.apple.com/library/mac/documentation/UserExperience/Conceptual/SpeechSynthesisProgrammingGuide/FineTuning/FineTuning.html#//apple_ref/doc/uid/TP40004365-CH5-SW3) for changing the rate:

```
say '[[rate 200]] hello'

```