Recorded sources, each listed as CC0 1.0 by its creator:
Male Voice US-English (48/24), neilraouf: https://freesound.org/people/neilraouf/sounds/469039/
Keyboard Typing, katfolker: https://freesound.org/people/katfolker/sounds/426872/
room big fan, Yuval: https://freesound.org/people/Yuval/sounds/210098/
room tone small noisy distant traffic through partially open window resonate in plaster box room Kampala, Uganda, Africa 2016.wav, kyles: https://freesound.org/people/kyles/sounds/407206/

https://creativecommons.org/publicdomain/zero/1.0/

Recorded source excerpts were mixed for this prerecorded demonstration. The clips use the same input and shared playback gain. KleenMic Quality mode processed the saved file; this is not a live call. Ten seconds starting at speech onset, with matching short edge fades. Public HQ MP3 previews were used, not the original lossless uploads. No endorsement is implied.