Just rebooted and the randomly cutting out sound stopped.

I also notice that when I adjust the mixer in "Sound Preferences" with
alsamixer open in the background to monitor the mixer setting of the
other channels randomly jiggling around, the tinny sound doesn't happen
when the PCM and other channels channel are %100. Also the other
channels don't seem to jiggle when a

Also if I lower the volume to 0% in "Sound Preferences" the MUTE setting
kicks in and doesn't unmute when raised unless I untick the mute box,
although that seems to be a bug for that specific program and probably
another separate issue. PulseAudio is really sucking...

I'm now using the following as it seems that stopping the 2ndry channels being 
randomly effected by the master channel solves the issue and that blocking the 
PCM chanel specificaly stops the Front, Surround, and so on channels being 
effected:
while true; do; amixer set PCM 100%; done

-- 
New Gnome mixer makes sound tinny/crackly, alsamixer doesn't
https://bugs.launchpad.net/bugs/439718
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