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diff --git a/speakerSqueaker.sh b/speakerSqueaker.sh
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+#! /bin/bash
+# Workaround for stupid 'powersave' 'feature' of Creative Speakers
+#
+# SJP 11 Dec 2021
+#
+# Record a snippet of default stream:
+
+# 0 rec -d  -n trim 0 .1 stat 
+
+#    rec       sox in record mode
+#    -d        default input
+#    -n        direct output to /dev/null
+#    trim 0 .1 duration 0.1 second
+#    stat      write info about the audio stream
+#    2>&1      redirect stderr to stdout 
+#    |         pipe
+#    grep      finds this line:    Minimum amplitude:     0.000000
+#    |         pipe
+#    awk       ruturns just the third word (the number)
+#echo hello $USER | systemd-cat -t AlexySayle -p warning
+maxAmp=$(rec -d -c1 -n trim 0 .1 stat 2>&1 | grep 'Maximum amplitude' | awk {'print $3'})
+echo Max Amplitude = $maxAmp
+if [ "$maxAmp" == "0.000000" ]; then
+    # if Max amplitude = 0 then we have silence!
+    if [ -f "/tmp/silencemarker" ] ; then
+        # There was silence last time we checked, so play the tone
+        echo Play the sound
+        play -nq synth 1 sine 40 fade 0.2 0
+        rm /tmp/silencemarker
+    else
+        touch /tmp/silencemarker
+    fi
+else 
+    if [ -f "/tmp/silencemarker" ] ; then
+        rm /tmp/silencemarker
+    fi
+fi
+
+systemd-run --user --on-active=10m /usr/local/bin/speakerWatchdog.sh
+
+#to generate a tone that is not audible:
+#play -n  synth 1 sine  40 fade .2 0
+#
+#  play    sox alias
+#  -n      dummy input file
+#  synth   synthesise a sound
+#  sine    sine wave [the default, so not strictly necessary]
+#  40      Hz
+#  fade    fade in from zero volume to max volume over 200 msec.
+#          '0' says fade out at end over same period.