For Windows users, the easiest way to record text-to-speech is using the
popular freeware Audacity (https://audacityteam.org) with Windows screen
reader Narrator (C:\Windows\System32\Narrator.exe) using wasapi loopback
(this also works using any other text-to-speech / screen-reader program):

(using Tor Browser 13.5.1)
https://duckduckgo.com/?q=audacity+wasapi+loopback
>...
>https://manual.audacityteam.org/man/tutorial_recording_computer_playback_on_windows.html
>...
>Windows WASAPI loopback recording
>Tip This is the recommended method of recording audio playing on the
>computer on Windows with Audacity.
>On Windows, you can choose the Windows WASAPI Audio Host and then the
>(loopback) input in the Recording Device box. Choose the loopback input
>for the computer playback device you will be listening to (for example,
>"Speakers (loopback)". The loopback input records computer playback even
>if your sound device lacks its own stereo mix or similar input.
>WASAPI loopback has a big advantage over stereo mix or similar inputs
>provided by the audio interface. The capture is entirely digital (rather
>than converting to analog for playback, then back to digital when Audacity
>receives it).
>Advice Windows WASAPI host only records loopback when there is an active
>signal present. When there is no active signal, recording pauses and will
>restart once an active signal resumes.
[end quoted excerpt]