After turning on Narrator in your Windows 10 PC, you are able to change the speed and pitch of the Narrator voice, referring to the following instruction.
Video guide on how to change speed and pitch of Narrator on Windows 10:
Step 1: Open Change Narrator settings by search.
Click the Search button on the taskbar, type ease of access in the blank box and tap Change Narrator settings.
In the Narrator settings, change speed and pitch respectively in the Voice settings, as shown in the picture below.
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