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No matter what advice I follow - fiddling with /etc/pulse/daemon.cnf or /etc/pulse/default.pa or /usr/lib/alsa/asound.state - it makes no difference: the sound from YouTube keeps hesitating and sometimes I get a burst of what sounds like a square wave.

Chris Leake
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    Details please what has been the fiddling. If we do not know hat you have done, exactly it is hard to suggest anything that you have not already tried. – David Oct 05 '21 at 12:04
  • would you mind running the command sudo apt install inxi and subsequently running the command inxi -A. This should provide us with the necessary info. If not, it should at least get us closer. Also, which browser are you using. If the sound only messes up with youtube, then it isn't pulseaudio or alsa. – Nate T Oct 06 '21 at 01:54
  • Audio: Device-1: Intel driver: snd_hda_intel Device-2: NVIDIA TU116 High Definition Audio driver: snd_hda_intel Device-3: ARC Camera type: USB driver: snd-usb-audio,uvcvideo Device-4: Texas Instruments PCM2704 16-bit stereo audio DAC type: USB driver: hid-generic,snd-usb-audio,usbhid Sound Server: ALSA v: k5.11.0-37-generic – Chris Leake Oct 06 '21 at 17:25
  • I think the sound from my CD external hard drive is fine. YouTube videos and Teams audio are the problem. They both identically splutter, and occasionally produce what sounds like a square wave. – Chris Leake Oct 07 '21 at 11:09
  • Nope - make that audio from my CD external hard drive as well !!! What a pile of crock! – Chris Leake Oct 07 '21 at 11:11
  • So, I finally appear to have cured the problem after following https://askubuntu.com/questions/1158648/audio-stuttering-crackling-in-ubuntu-18-04 – Chris Leake Oct 07 '21 at 13:44

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I found the answer eventually!

I network to the internet by ethernet hard wired to my broadband box - but I also had wifi on.

When I turned wifi off, behold the stuttering stopped.

Chris Leake
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