Audio Recorder Online - Capture Screen Audio

Click "Start Recording" and tab goes silent... Why ???

"Mute Tab" option left blank... Chrome tab never muted by user

Websites below went silent after I "Start Recording", then unmuted after I "Finish Recording"

The finished .mp3 file has no sound


https://www.qtfm.cn/channels/448226/programs/22761241

https://www.discovermagazine.com/the-sciences/translation-of-tiny-scroll-tucked-inside-1800-year-old-amulet?utm_source=firefox-newtab-en-us