Audio samples on https://diffio.ai/audio-cleaner/

Each sample is a real recording from Wikimedia Commons, the Internet Archive (radio aporee) or Freesound. An excerpt was cut from the source file (20 ms fade in and out,
no other processing), uploaded unchanged to the production Diffio API and restored with Diffio 4.5 Flash and Diffio 4.5 Pro on October 19, 2026.
For show-announcer and zoo-keeper, a longer excerpt was restored and the original, Flash and Pro files were then trimmed to the same window
(20 ms fades) where machine transcripts of all three agree; the excerpt times below are that final window.
The downloaded result is restored speech with no background mixed back in. For playback, each file in a sample got one fixed gain so all
three play at the same integrated loudness (about -20 LUFS), then was encoded once as 112 kbps mono MP3. No compression, limiting or EQ.
The restored files are adaptations of the originals and carry the same license as their source.

[show-announcer]
Title: Red Way, York YO62 7LE, UK - Farndale Show Soundscape ...
Source page: https://archive.org/details/aporee_41122_46928
Original file: https://archive.org/download/aporee_41122_46928/1808281296.mp3
Author: david m, for radio aporee ::: maps
Recorded: 2018-08-27, Farndale Show, North Yorkshire, UK
License: CC BY 3.0 (https://creativecommons.org/licenses/by/3.0/)
Restored excerpt: 812.0 s to 856.0 s of the original. Page excerpt: 835.62 s to 850.8 s (15.18 s)
Files: show-announcer-original.mp3, show-announcer-flash.mp3, show-announcer-pro.mp3

[room-echo]
Title: Carolyn Hewson delivering the 2026 Joseph Fisher Public Lecture at Adelaide University.ogg
Source page: https://commons.wikimedia.org/wiki/File:Carolyn_Hewson_delivering_the_2026_Joseph_Fisher_Public_Lecture_at_Adelaide_University.ogg
Original file: https://upload.wikimedia.org/wikipedia/commons/e/e4/Carolyn_Hewson_delivering_the_2026_Joseph_Fisher_Public_Lecture_at_Adelaide_University.ogg
Author: Wikimedia Commons user Pangalau
Recorded: 2026-05-27
License: CC0 (https://creativecommons.org/publicdomain/zero/1.0/)
Excerpt: 0.0 s to 12.22 s of the original (12.22 s)
Files: room-echo-original.mp3, room-echo-flash.mp3, room-echo-pro.mp3

[mains-hum]
Title: Human Legacy Lecture -1.ogg
Source page: https://commons.wikimedia.org/wiki/File:Human_Legacy_Lecture_-1.ogg
Original file: https://upload.wikimedia.org/wikipedia/commons/7/73/Human_Legacy_Lecture_-1.ogg
Author: Austin L. Blair (Wikimedia Commons user MrABlair23)
Recorded: 2010-06-19
License: Public domain (Released into the public domain by the author ({{PD-self}} on the file page))
Excerpt: 12.09 s to 27.3 s of the original (15.21 s)
Files: mains-hum-original.mp3, mains-hum-flash.mp3, mains-hum-pro.mp3

[overloaded-train-interview]
Title: Lisa_Vox-Nancy_Train.mp3
Source page: https://freesound.org/people/kerouacsamerica/sounds/31559/
Source file: https://cdn.freesound.org/previews/31/31559_212155-hq.mp3 (the Freesound high-quality preview; the original upload needs a Freesound login)
Author: kerouacsamerica (Kerouac's America, a SUNY Potsdam travel course); interview by Lisa Geppinger
Recorded: on the California Zephyr (Amtrak), uploaded to Freesound 2007-03-01. Uploader's note: "PMD was overmodulating at low recording levels"
License: CC BY 3.0 (https://creativecommons.org/licenses/by/3.0/)
Excerpt: 30.3 s to 46.8 s of the source file (16.5 s)
Files: overloaded-train-interview-original.mp3, overloaded-train-interview-flash.mp3, overloaded-train-interview-pro.mp3

[zoo-keeper]
Title: St. Louis Zoo, St. Louis, Missouri, USA - Penguin Tour
Source page: https://archive.org/details/aporee_62524_71950
Original file: https://archive.org/download/aporee_62524_71950/PenguinTour.flac
Author: Pierrot Desperes, for radio aporee ::: maps
Recorded: 2023-12-29, Saint Louis Zoo, St. Louis, Missouri
License: Public Domain Mark 1.0, applied by the recordist (https://creativecommons.org/publicdomain/mark/1.0/)
Restored excerpt: 105.0 s to 186.0 s of the original. Page excerpt: 114.9 s to 126.7 s (11.8 s)
Files: zoo-keeper-original.mp3, zoo-keeper-flash.mp3, zoo-keeper-pro.mp3
[walkthrough video and screenshots]
Files: walkthrough.mp4, walkthrough.webm, walkthrough-poster.webp, walkthrough.vtt, walkthrough-transcript.txt, upload-choose-model.webp, compare-original-restored.webp
Screens: real Diffio app screens (Chrome, signed in to a Basic-plan test account on a local development stack running the October 19, 2026 dev branch), captured October 19, 2026 while restoring the show-announcer excerpt. Diffio's own.
Audio: the show-announcer excerpt above (david m, radio aporee, CC BY 3.0) and the restored speech downloaded from that project in the app (Diffio 4.5 Pro, Background amount 0%), each set to the same loudness. No narration or music.
Made with HyperFrames; waits are shortened. The video plays original 0.0-8.7 s and 8.9-13.9 s, and restored speech 8.9-15.18 s, of the excerpt. Credit: david m, radio aporee, CC BY 3.0.