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Freesound - "Dialup.mp3" by Jlew
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Old Modem Internet Connection Sound Effects - YouTube
MP3 format : An Overview
Portable Bluetooth MP3 Music Player Hi-Fi Lossless Sound Radio Recorder 32GB | eBay
Dial Up Modem ~ Stock Sound Effect #42160010 | Pond5
Dial-Up Modem Sound | What Was That Dial-Up Internet Sound?
How MP3 Files Work | HowStuffWorks
Modem.Wav & .MP3 Sounds
How A Dial-up Modem Handshake Works | Hackaday
The Freesound Project" for downloading free sound material - GIGAZINE