Workaround: when I hear the distorted sound, I open a terminal and issue
this command

$ killall speech-dispatcher


This works until the next time I hit a web site that causes the issue. 

I don't know anything about speech dispatcher, but I wonder if multiple
speech-dispatcher processes be interfering with each other? I usually
start with

$ ps uax | grep speech

and I usually see five or six processes

twt@host:~$ ps uax | grep speech
twt       9165  0.0  0.0 289000  5092 ?        Sl   11:01   0:00 
/usr/lib/speech-dispatcher-modules/sd_dummy 
/etc/speech-dispatcher/modules/dummy.conf
twt       9168  0.0  0.0 289012  4976 ?        Sl   11:01   0:00 
/usr/lib/speech-dispatcher-modules/sd_generic 
/etc/speech-dispatcher/modules/generic.conf
twt       9171  0.0  0.0 289000  5088 ?        Sl   11:01   0:00 
/usr/lib/speech-dispatcher-modules/sd_cicero 
/etc/speech-dispatcher/modules/cicero.conf
twt       9176  0.0  0.0 327320  8756 ?        Sl   11:01   0:00 
/usr/lib/speech-dispatcher-modules/sd_espeak 
/etc/speech-dispatcher/modules/espeak.conf
twt       9181  0.0  0.0  97216  2220 ?        Ssl  11:01   0:00 
/usr/bin/speech-dispatcher --spawn --communication-method unix_socket 
--socket-path /run/user/1000/speech-dispatcher/speechd.sock

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https://bugs.launchpad.net/bugs/1736222

Title:
  speech-dispatcher distorts all sound

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